Just for starters: recreational marijuana is legal in my state.

So as I'm sure you older folks are aware, they've scienced the shit out of weed in the past decade or two. I knew what I was doing when I was 20, but the game has changed and I'm lost. I know nothing about vape pens, but I know that no one smokes bowls anymore.

My friends have assured me that you just buy a 'battery', which is the actual vape pen, and a 'cartridge', which is the oil. That makes perfect sense to me. But I've also been told that, basically, all cartridges fit all batteries.

I'm looking online at my delivery options (via weedmaps, which is the only site I'm aware of), and almost all of the 'batteries' look like proprietary systems which would not fit the little round cartridges which seem to be the standard. Am I totally missing something? Is there a way to tell if they use proprietary cartridges? Is there a better delivery service / site?

(For that matter, are there any brands that are considered desirable or reliable? I know nothing about this.)