

Valve has put a lot of work into it, so unless you want to play hypercompetitive shooters (which ban Linux as a scapegoat for how hacker infested they are), most games will just work. Installing Steam should just set things up automagically for Steam games.
If there’s a game you’re actively curious about, you can look it up on https://www.protondb.com/ to see what other people say about how well it works.


If you’re going to add Mint repos anyway, why not just use LMDE or Mint instead of Debian? It probably would avoid strange version mismatch issues.