https://browse.feddit.de/ to find new groups to follow. My default view is set to communities that I subscribe to, sorted by new comments (though I will likely change that to new as growth continues).
After I've been through the stuff I subscribe to, I have a look at everything else
You can create communities on your local instance, and they will be available to everyone else on the fediverse! You don't need to host your own instance to create a community
@canibeserious Not yet. We are starting to see things like account migration in the microblogging fediverse space, so I imagine it will arrive in the groups/communities space one day. This area of the fediverse is a lot less mature though, so I imagine it will be a while, as they'll be focused on essential features first
@SafetyGoggles The difference between those two is the moderation policies of the instance. Beehaw doesn't federate with the same instances that lemmy.ml does, and has an explicitly more inclusive and less generalist approach. They both cover the same ground, but you couldn't just merge them.
Having said that, it would be nice to see a user level feature that lets end users combine communities in to one "virtual" community in their interface.
@blob42 kbin has the ability to aggregate content in to a community by hashtag (in a distinct tab) and it's incredibly useful. I think lemmy could really benefit from something similar
@GuyDudeman Time to get learning then ;)
@Woedin