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The Britannica entry for the Fediverse is really good
(www.britannica.com)
A community to talk about the Fediverse and all it's related services using ActivityPub (Mastodon, Lemmy, Mbin, etc).
If you wanted to get help with moderating your own community then head over to !moderators@lemmy.world!
Learn more at these websites: Join The Fediverse Wiki, Fediverse.info, Wikipedia Page, The Federation Info (Stats), FediDB (Stats), Sub Rehab (Reddit Migration)
Lemmy is all about groups. It doesn't have any way to connect to and interact with single users.
Mastodon, on the contrary, is all about single users following single users. It has no support for groups whatsoever. Mastodon users can follow Lemmy communities, yes. They can reply to posts, but in a very Mastodon way (automatic mentions, they'll probably insert hashtags etc.). Seeing (almost) the entire conversation is the default on Lemmy and extremely tedious and anything but straight-forward on Mastodon. And starting a new thread in a Lemmy community from Mastodon is difficult, nobody knows how to do it right, and whoever tries it will clash with Lemmy's culture.
Stuff like Friendica or Hubzilla is somewhat more general-purpose. It can do both. But I've yet to see a Lemmy user subscribe to a Friendica group or a Hubzilla forum (the opposite does work).