I'm using linux on my (mostly work) laptop already. The only real reason I'm still using windows on my pc is riot games lol
i'm already using ueli, which (on first glance) seems even more powerful than that. it's great, don't get me wrong, but again it's just an addition to what is already there
The "showing more communities" part is called federating. basically, an instance (@lemmy.world in ur case) has a bunch of communities. now the owner of that instance can "federate" with another instance, so that you can additionally view their communities as well.
I'm a complete newb with Lemmy as well, but as far as I know, lemmy.world for example only defederated some extremist instances (and threads if I'm not mistaken?)
@fazey_o0o
@lemmy.world