じゃ、吹奏楽の基本的のことから教えてあげる。

Ja, suisougaku no kihonteki no koto kara oshiete ageru.

Then I’ll teach you about concert band starting from the basics.

Nowhere in what was said has a word for “you” in it, as in this context, it’s not necessary. To break it down a little bit to help you get the picture, we have

Ja, suisougaku + no + kihonteki + no + koto + kara + oshiete + ageru.

Then, wind instrument + ‘s + basic + ‘s + thing + from + teach + give.

It’s made especially easy to pick up that there is an implied “you” in there, because Asuka (the speaker) is saying ageru which basically means to give the person the favor of whatever verb it’s attached to. She also says this while approaching who she’s talking to, so it’s pretty obvious.

Additionally, it can be rude to use “you” if you actually know the person’s name. In fact, it’s pretty good for creating space or sometimes showing a bit of disdain towards the person you’re saying it to. Once we get into the more media common examples, this will become pretty clear, but this use can extend to pretty much every word for “you.”

Anata・貴方・あなた

Along with the next in the list, kimi and anata will probably be the ones you hear the most. Anata is pretty unassuming and is usually good when used when talking to people who you may not have met yet (or maybe you forgot their name. You should probably ask what their name is again). There are some people who will use this to create space while still trying to be polite too, like if a main character guy is trying to creep on a girl that isn’t having it, but still has to go through the pain of talking to him.

As far as using it for people you might not know, here’s an example from Clannad: