Looks like someone has already subbed, so it should show up now, but essentially you just manually put in the url and go there. for example this page on kbin is https://kbin.social/m/nostupidquestions@lemmy.world, just change that to https://kbin.social/m/flyfishing@lemmy.world and subscribe with a kbin account.
Turns out there is a few other ways to do it as well, this stack exchange post should have some more information if you want it.
You can run most games on Linux, you just have to enable proton, the steam deck uses a custom version of Linux by default, so at minimum anything marked as playable will work on Linux.
Also I never had to deal with drivers at all when setting up linux, but I’m not sure if that’s normal, I’ve only used Linux mint, which was pretty easy to set up.