Unseen University - Pratchett's magic school, as referenced in DAgent's first post. Read as any school of wizardry/magic/witchcraft etc.etc.
Re the whole genre can help writers just like a trope...
Well, yes. Of course. Genres are basically collections of tropes. To know a genre is to know a whole slew of the things, all connected and wriggly.
The extent to which they help writers is the same as tropes do. I think most writers are happy for only having a working subconscious knowledge of the blighters. Out of those who like knowing more, I think the majority of that number do so because they like coming in with their dynamite and wrecking balls, and like to know exactly where to hit the walls to make the biggest mess.
The number of authors who like knowing about genre to help them write in that genre are, I think, few. I don't really recommend trying to be one of them unless you're horribly aware you're one of them (I suspect I am). There is a lot of second-guessing in the brain.
Where I think it comes most in useful is in recognising that you've walked into a trap in edits... but that's editor knowledge, not writer knowledge.
Also, per my usual "this stuff is hard enough without trying to load up everything in your head", I think there's enough challenges in writing good prose, finding interesting material, and recognising how to write interesting narratives without getting really stuck on genre, beyond the parts of genre that are baked into interesting narrative. You get enough of the stuff from that, no need to go hard beyond it.