The hard part has only just begun LMAO

Guys, this is gonna sound super stupid, but I’ve just started using Memmy. I’m a bit confused and wondering if someone could help me out. So subreddits would translate into communities? I’ve tried finding a lot of communities but couldn’t find them, like subreddits, do you guys wait for them to be created or something? Is lemmy a new thing? I’ve been trying to find something other than Reddit as I’m an Apollo user and well, imma have to use something else!