You’re not a doofus if you don’t understand Dota 2. I’ve put literally thousands of hours into it and I’m not always sure I understand it. But I do know it’s a lot of fun to watch.

With the 2017 International Dota 2 Championships’ main event set to get underway, maybe you’re curious about what all the $20-plus million, 13 million monthly player hubbub is all about. But maybe you’re also frustrated — Dota 2 is an extremely complicated game, and clicking on a stream of the game to watch is like jumping into the deep end of a pool with a half-inflated flotation device.

But we’re here to help! We want to help you understand what Dota 2 is, what you might see, and how to watch it as quickly and painlessly as possible. Because this week is likely to see some of the best, most exciting competitive gaming of 2017.

I’m going to do everyone a favor, and put the summary cheat sheet at the beginning. Then we’ll get into more detail.

Even the most basic information about Dota 2 can seem intimidatingly complex. So let’s summarize. The pregame draft is a chess match. Many games are won or lost in the draft. Casters will give you an idea why.

Kills are important, but not everything. Higher-level heroes are worth a lot more as a kill.

The team with fewer towers is often at a disadvantage. The team taking objectives is usually winning. But taking an enemy base is hard, and it’s where many games’ momentum can shift — especially this year, because of shrines.

Roshan is an important kill, but a bad fight at the Rosh pit can sink a team that previously held the advantage.

The team with the economic advantage will usually win the game.

What is Dota 2?

(Or: How I learned to stop worrying about MOBAs and watch a competitive action-RPG)

Dota 2 is, in a nutshell, a competitive action role-playing game.

Each of Dota 2’s 100+ characters, referred to as heroes, have different abilities and traits that can help their teammates or harm their opponents in a variety of ways. Each player gets one character, and no one else can use that character. Players receive gold and experience for killing AI-controlled units on the map, and receive even more experience and gold for killing players on the other team. When one side destroys an structure, all players on that offending team receive a gold bounty. And players also receive a slow, steady trickle of gold passively over time.

If you’ve played any loot-grinding action game, like Diablo or, hell, even Destiny (kind of), you’ve got the basic idea.

There’s more to Dota 2 than that, but this is a good starting point. Kill more stuff, level up, get more abilities, buy better gear. If you’re ever confused, just come back to that.

How to watch The International 2017 Twitch As with just about any competitive video game now, the easiest way to watch The International is probably Twitch . However, there are arguably better ways to spectate the most financially lucrative esports tournament ever. Dota2.com Valve is once again streaming every game of TI7 on Dota 2 ’s website . In addition to multiple versions and languages for each stream, you can also view each match with accompanying real-time information about the game in question, including hero levels, a live minimap, XP and gold graphs, and more. Dota 2 If you’ve purchased The International Battle Pass within the Dota 2 client, not only have you contributed money to TI7’s massive prize pool, you’ve also bought a ticket to watch the tournament inside the game. Watching in-game gives you complete control of your view of the action, while also providing the same professional spectator experience and casting you’d get on Twitch or the Dota 2 site. Viewers who watch within Dota 2 can also earn prizes for specific in-game events, make predictions on various aspects of each match, and win battle points and more prizes. VR Valve has created a unique spectator experience just for you, if you’ve got an HTC Vive and have Dota 2 installed. I’ll let my colleague Ben Kuchera tell you about it : Watching battles take place around you is thrilling, even though it can be a bit hard to keep track of everything that’s going on. The interface makes it easy for you to switch views or jump back and forth from the in-person view to the lobby as well; it only took me a few minutes to get used to moving back and forth to get the best view of the action. It’s like being able to watch a football game on TV with the ability to jump onto the field at any time to see what it looks like from the quarterback’s point of view.

Dota 2 takes place on the same map every game.

It’s a field, kind of like a football or soccer field, except there’s an endlessly reincarnated dragon in a pit and the woods are full of monsters that will attack anyone who gets close. The map is split diagonally down the middle by a river. This is important. When someone refers to "the river," this is what they’re talking about. The bottom left half of the Dota 2 map is "The Radiant" side, which is colorful and vibrant. The upper right half of the Dota 2 map is referred to as "The Dire," and looks corrupted and dying. Teams are referred to as the Dire or Radiant depending on which side they spawn on. Dota 2’s map has a time of day as well, which affects things like how far heroes can see. Some heroes even have abilities tied to the time of day.

Each "side" of Dota 2 has a central structure called an "ancient."

The Radiant ancient is at the Radiant base in the lower left-hand corner of Dota 2’s map. The Dire ancient is located in the upper-right corner of Dota 2’s map. The ultimate goal of any Dota 2 match is to destroy the other team’s ancient. This is easier said than done.

Dota 2 matches do not have a time limit.

Games will go on until one side’s ancient is destroyed, or one team surrenders by typing “GG” into Dota 2’s in-game chat (note: this mechanic is only present in Dota 2’s Captains mode). Most professional matches last 30-45 minutes, anecdotally speaking, though hourlong matches — or longer — aren’t uncommon.

The map in Dota 2 has three main paths, called "lanes."

The top lane — or just "top" — runs along the left and top sides of Dota 2’s square map. The middle lane — or "mid," as players call it — runs diagonally from the lower left of the map to the upper right. The bottom lane — "bot" for short — runs along the bottom side of the map and then up the right side. In between each lane is "the jungle," which contains small camps of neutral monsters that will attack anyone who gets close.

The Radiant and Dire bases spawn "creeps."

Inside each base, there are three sets of "barracks" — or "racks/rax" in Dota 2 shorthand — that spawn friendly units called creeps. Creeps walk down each lane toward the enemy base, mindlessly attacking any enemy or neutral unit. Radiant creeps attack Dire units and structures, while Dire units attack Radiant creeps and structures.

When creeps are killed, they give experience to any enemy hero within a certain range, and they give extra experience and gold to a hero who delivers a killing blow to them. This is called "last-hitting."

However, a player can attack a friendly creep that’s below half health. If a player gets the last hit on a friendly creep, killing it, enemy heroes receive no gold for that creep, and only half the experience they’d otherwise receive. This is called a "deny."

Denying is one of the primary differentiating factor of Dota 2 from similar titles, and it’s only become more important with recent updates. For games played during The International 2017, any hero that denies a friendly creep also earns bonus experience for doing so.

In some special circumstances, players can "deny" their teammates, preventing the other team from getting any gold or experience for that kill. Heroes killed by "neutral" units on the map also give no experience or gold. This is a higher-level tactic employed by players in some situations to keep their opponents from gaining an experience or gold advantage from a kill.

Each lane is protected by towers.

The lower left side of the map is protected by Radiant towers, and the upper right is protected by Dire towers. Radiant towers attack Dire units, and Dire towers attack Radiant units. There are three towers in each lane. The towers closest to the river are called the "Tier 1" towers. Between the entrance to each base and the Tier 1 towers are "Tier 2" towers, and the entrance to each side’s base is protected by a Tier 3 tower. Towers must be destroyed in order — the Tier 1 tower has to fall before the Tier 2 tower can be attacked, and so on. A team’s ancient is protected by a pair of Tier 4 towers.

Once a lane’s towers fall, barracks can also be destroyed. If a barracks is destroyed, creeps will still spawn in that lane, though they will be weaker, which allows the other team’s stronger creeps to get closer and damage the enemy ancient. If all of a team’s barracks are destroyed, the other team is rewarded with "mega creeps," which are much more powerful units that even many heroes will have difficulty dealing with effectively. Mega creeps can easily destroy buildings, given the opportunity.

2017’s big addition: shrines

With the close of the 2016 competitive season, Valve made huge changes to Dota 2’s in-game map. Lanes were altered, the spaces between lanes were redesigned, and, perhaps most importantly, a new type of building was added: the Shrine.

Shrines in Dota 2 are buildings that, once activated, provide health and mana regeneration for a short period of time to friendly units when triggered. Each team has a total of five shrines: three in their base, and one each between the mid and top lanes and mid and bottom. A used shrine has a five minute cooldown before it can be used again.

Shrines are important for a few reasons. They provide a means of “sustain” — meaning players can remain active on the map without having to return all the way home to restore their health and mana. Shrines also provide excellent defensive points on the map in the early game against aggressive enemy lineups — it’s difficult to “fight into” an enemy shrine, because of the fast health regeneration they provide to the defending team. Finally, friendly shrines may be teleported to by their respected teams, offering an additional spot for teams to respond to enemy aggression or points from which to stage their own maneuvers. A team’s shrines are invulnerable until that team loses a Tier 3 tower.

These are the basics. With that info, you should be able to watch a game of Dota 2 and have a basic idea of what’s going on.

Heroes hitting each other

There’s a lot more to the game than that, obviously. Dota 2 is as much about the way players interact with each other as anything else. Let me try to explain.

The Draft

Before a competitive game begins, there’s the draft. During the draft, each team takes turns banning some heroes, which prevents either team from selecting them, and picking heroes for their players. The back-and-forth of the draft is a game unto itself. Each team designates one player, usually the team captain, as their “drafter.” It’s the drafter’s job to think steps ahead of the other team, denying them the heroes they want and the strategies they plan to carry out, while securing the tools needed to win. You’ll often hear casters say a game was won or lost in the draft, and this isn’t an exaggeration.

Heroes

Dota 2 has 113 heroes, each with their own unique sets of abilities that evolve and grow as they gain experience and level up. Generally speaking, a Dota 2 character has three "normal" abilities and one "ultimate" ability, but they can’t pick them all at once. Instead, players receive one point per level to unlock an ability, to level up an already-unlocked ability to make it more powerful, or to increase their basic attributes, or "stats." Stats determine how much health a hero has, how many spells they can cast (their "mana pool"), how fast they attack, and the degree to which incoming damage is reduced, which is referred to as "armor."

Ultimate abilities, or "ults," aren’t available for most heroes until they reach level six, which is important. The tempo of a Dota 2 match begins to accelerate and change when more and more heroes unlock their ultimate abilities. Ults are usually very powerful, but take more time to become available again than most other abilities.

At the end of 2016, Valve added an entirely new mechanic to Dota 2: talent trees. Talents are available at level 10, 15, 20 and 25, and are presented as either/or choices particular to every hero. Talents can make a big difference in how characters play and what roles they fulfill.

Items

Heroes in Dota 2 aren’t limited to what they were "born" with. Instead, they can use gold to purchase items from one of Dota 2’s shops.

The inventory and the Backpack Every player can hold a maximum of six “active” items at a time, but at the end of 2016, Valve gave every character a new tool: the backpack. The backpack can carry up to three additional items, but there’s a catch — any item moved from a player’s backpack to their active inventory space has a brief cooldown period during which it is unusable and provides no bonuses. In addition, usable items with cooldown timers will see that timer delayed if placed in the backpack.

There are three kinds of places for players to purchase items. Basic shops in either base sell consumables, items that can be used a limited number of times for various purposes, like regenerating health or mana out in the map; town portal scrolls, which allow the user to teleport to a friendly structure like one of their towers or their base; and the like. These shops also sell more expensive items that provide boosts to a hero’s stats or actually give them new abilities, like instantly teleporting a short distance — or "blinking" — or pushing themselves or another player. More powerful items can’t be bought outright. Instead, they’re built by buying a specific set of other items that then combine into something new.

You’ll often hear casters or other players refer to specific heroes as "item-dependent." This means that character needs specific items to become truly effective. For example, if a character can cast a spell that completely immobilizes any enemy hero caught within it, but lacks an ability to catch those heroes with that ability, they might want to buy a blink dagger, the item providing the aforementioned instant teleport. Without that item, the player’s ability to use their abilities is diminished. Other heroes can do a lot of damage up close, but can be quickly eliminated by spells. These characters might need a BKB, which will render them immune to all but a few extremely powerful spells for a limited amount of time.

Items are important, is what I’m saying.

Important items in Dota 2 Wards: Wards in Dota 2 come in two varieties: observers and sentries. Observers are invisible objects that last for six minutes and are used to gain vision over places on the map to monitor enemy movement. Defensive observer wards are stationed on the placing team’s side of the map. Offensive observer wards are placed on the enemy team’s side of the map, often behind towers or in the jungle, to secure objectives or kills on unsuspecting heroes. Sentry wards do not provide vision by themselves, but instead reveal invisible units — including observer wards. "Dewarding" means revealing and destroying an enemy team’s observer wards, which robs them of information and awareness of the map. Runes : There are two categories of runes in Dota 2 — power runes, which grant a special bonus to the player who activates them, and bounty runes, which provide gold and experience to the player who picks them up. Bounty runes spawn every two minutes at four spots on Dota 2 ’s map: two places on Dire’s side of the map, and two places on Radiant’s. Power runes also spawn every two minutes, but only one at a time, and randomly at the top or bottom of the river that divides the map. There are 5 kinds of power rune: Haste — which provides maximum move speed to the hero who collects it; Illusions — which create less powerful duplicates of the hero who grabs them; Double Damage — which should be self explanatory; Regeneration — which refills a heroes health and mana pool quickly over time; and Arcane runes, which reduce the amount of mana required to cast a spell, and reduces the cooldown of any spell cast or item used. Runes collected also refill player bottles, with bounty runes providing two charges and power runes refilling them completely. Runes can be held in a bottle for up to two minutes, allowing them to be saved until needed. Tangos: Tangos come in stacks of four from the main shop in each team’s spawn point. Tangos can be used to consume a tree on Dota 2 ’s map to provide a healing boost to the player who uses them. Tangos can also eat enemy wards, which provide the healing bonus for twice as long. Town portal scrolls: Town portal scrolls, or TPs, are used to relocate to a friendly structure. TP scrolls allow players to escape dangerous situations or respond to enemy aggression elsewhere on Dota 2 ’s map. However, town portal scrolls take time to cast. If a hero is stunned while casting a town portal scroll, the spell is interrupted, wasting the scroll. Also, each new hero teleporting to a tower or structure takes longer to channel the TP scroll than each previous hero for a short time. Smoke: A smoke is a single-use item that turns all allied heroes within a certain radius invisible for a period of time, and also grants increased move speed. Smoked heroes are not detectable by wards, but are revealed once they get within range of enemy heroes. Smokes are used to sneak into the rosh pit, to find unsuspecting enemy heroes to kill or "gank," or even for support players to place wards around the map undetected. Each team’s main shop can carry only a few smokes at a time, and when they’re exhausted, it takes quite a while for them to come back in stock. The Gem: The bearer of a gem can see any invisible unit or object, but there’s a catch: If the carrier of a gem is killed, the gem falls to the ground, and any player, friend or foe, can pick it up. Gems take a long time to come back in stock once bought, and a team that loses their gem will often lose all of their wards to the other team. Black King Bar: The Black King Bar, or "BKB," provides its user with a period of immunity to almost all spells and magic effects in the game. Of course, there’s a catch: The BKB has a long "cooldown" after use. Also, while the BKB is effective for 10 seconds initially, this duration diminishes by one second with each use. The minimum BKB duration is five seconds, though on the bright side, the lower the BKB’s next duration, the sooner it’s available after using it. The Divine Rapier: The Divine Rapier, or simply, rapier, is the "In Case of Emergency, Break Glass" fire ax of Dota 2 . The rapier is one of the most expensive items in the game and adds an incredible amount of raw damage. But that comes at a price: If a hero dies while carrying the rapier, they drop it, at which point any other player can pick it up. The rapier cannot be manually dropped by a player, unless they bought it originally and have not yet died with it in their possession. Otherwise, the holder must die for it to change hands. If a rapier is coming out, then shit is very, very real.

Timings

Dota 2 teams will play around time-based factors for the duration of every match. If a hero that needs a blink dagger to be effective finally has one, it might be time to catch the other team off guard with that. If an ultimate is available, it might be time to secure a kill or destroy a tower. Conversely, if the other team has used a powerful ult unsuccessfully, that provides their enemies with a window to secure an advantage. And if the other team’s item-dependent heroes aren’t doing as well as they need to in order to make those big purchases, smart opponents put more pressure on that team while they have an advantage. You might hear casters refer to "tempo control" — this means heroes and strategies that allow teams to better force the rhythm of a game.

Player “Positions”

While Dota 2 heroes can be somewhat flexible in how they’re played, in part due to items, players tend to fall into a few specific roles. Sometimes these roles are referred to by numbers, from Position 1 to Position 5, which refers to their economic priority — that is, who is given the most opportunity to amass gold and experience through killing, or "farming," neutral and enemy units. This is in ascending order of the player who is given the most farm.

Support players are responsible for buying consumable items for the team, like wards, which give their team vision of an area of the map. Support heroes often have healing or defensive abilities that keep their teammates alive. Some supports also have abilities to hold enemy heroes in place, in order to allow their teammates to attack more or prevent enemies from getting away. This is often referred to as crowd control, or "CC" — teams without CC can have a hard time securing kills on enemies that have a means of escape. Support heroes also often have spells that do a lot of comparative damage early on, before their enemies have time to buy more expensive items providing additional health or spell resistance. This makes supports very important in the early going, though they lose some damage potential in later periods of a match.

Supports are either Position 4 or Position 5. Position 5 supports will spend most of a match, well, broke, constantly buying wards and other consumables for their team ahead of their own immediate needs. Position 4 supports are often responsible for starting fights or making sure enemies don’t get away, and are more item- and/or level-dependent to be effective parts of their team.

Offlane or Position 3 players are sent to the bottom lane if Dire, and the top lane if Radiant. "Offlanes" are the most dangerous for each team, with the least safe space to sit next to the constant waves of enemy creep units to earn experience and gold. Offlane roles are often "initiators" — characters that start, or "initiate," a fight with the other team — or even counter-initiators that regain control when the other team attempts to start a fight or can help their team “disengage,” removing them from danger. Offlane heroes are usually "cores" for their team, responsible for much of a team’s damage in the early- to mid-game period of a match.

Midlane or Position 2 heroes are characters that benefit from having the most farm quickly. Because the middle lane of the Dota 2 map is the shortest distance between the Radiant and Dire sides, creep waves meet in the middle of the lane much more quickly, resulting in more opportunities to secure last hits and experience for players who lane there. Position 2 heroes often have devastating ultimate abilities that can assert an early advantage over the other team, and are almost always the first to reach level six in a game. These players will often be responsible for much of their team’s damage until the late-game stage of a match.

Carry or Position 1 heroes are so called because they "carry" their team. More specifically, carry players select heroes that become very powerful with experience and items, and they usually become the primary damage dealer for their team. Carry heroes are often more vulnerable early in a game, making them a target of the other team’s support heroes, and restricting their progress can be the difference between winning and losing. Carry players tend to be the most exciting to watch, making the riskiest, most dynamic plays — their skill can often turn the game in their team’s favor.

The kill bounty

Generally speaking, the most gold and experience in Dota 2 is awarded for killing an enemy hero. But this number, unlike for every other unit in the game, is not static. Instead, heroes are worth more and more gold and experience the higher level they are and more their "net worth" — that is, the higher the overall value of all their items. In addition, as players secure kills, a bounty is added to their head, and the more kills they score without being killed in return, the higher the bounty gets. Heroes with particularly large killstreaks might be worth thousands of gold if killed.

As with enemy creeps, when killed, heroes give experience to enemy players nearby. But unlike with creeps, killed heroes also give gold to all nearby enemies, and the hero who gets the last hit on an enemy player is awarded the kill and extra gold.

This system introduces one of Dota 2’s comeback mechanics: If a team is losing badly but can win one or two good fights, or secure just a few high-value kills on their opponent, the "gold/experience swing" — that is, the change in net difference between the two teams, economically and experience-wise — can get the losing side back in the game in a meaningful way.

Other things to know

Stacking

Neutral camps around Dota 2’s maps will spawn new creatures if those camps are empty when the in-game clock reaches the :00 mark every minute. If a player can draw a camp’s creatures out at just the right time, this will "stack" the camp, allowing for multiple camps’ worth of neutrals in one camp. Heroes with abilities that allow them to attack multiple enemies at once can often take advantage of this to farm more efficiently.

Ancient Creeps

There are special, extra powerful neutral creeps on Dota 2’s map referred to as "ancient creeps." Ancients are much harder to kill, but yield much more gold and experience than other neutral camps. Supports will often stack ancient camps for carry players to farm once they’ve become powerful enough to do so.

Roshan

Roshan, or "Rosh" for short, is a unique ancient unit powerful enough that teams may have to work in concert to destroy him. Killing Roshan yields a great deal of gold and experience, but the main prize is the Aegis of the Immortal. The hero that picks up the Aegis will, when killed, respawn again a few seconds later with full life and full mana. Roshan lives in a "pit" that has only one entrance, making it risky for the team attempting to kill him. If their opponents interrupt, they will generally have a very strong positional advantage. Many games turn on a single bad engagement in "the Rosh pit."

High ground

There are varying degrees of elevation on Dota 2’s map, referred to as high ground and low ground. High ground provides an absolute tactical advantage — heroes on low ground need an allied unit (or ward) on the high ground to see enemy units and to attack them, and attacks uphill have a chance to miss. The entrances to each base are elevated, making it difficult for the opposing team to attack. Many teams have difficulty taking high ground, and the fights they lose doing so can swing the game in their opponents’ favor, thanks to Dota 2’s comeback mechanics.

At this year’s International, high ground is going to be an even more difficult problem to solve for teams because of the addition of shrines to Dota 2. Shrines provide a burst of healing and resources to defending teams, and there are three in each base. This forces teams attempting to break high ground to consider whether or not the enemy team has shrines to rely on while they defend, and how many.

Fortification

Each team has the ability to make its structures invulnerable for a limited amount of time. You’ll know it by a golden glow (it’s identical to the effect present on heroes with a BKB active). Fortification takes five minutes to recharge, though the destruction of any of a team’s Tier 1 towers will reset the cooldown on fortification immediately.

It all seems like a lot, I know. It is a lot! Dota 2 is complicated. but regardless of how much you know about the game, it can be a hell of a lot of fun to watch. So pick up what you can as you’re able, and enjoy some of the best esports you’re likely to see in 2017.