The onboarding will offer you a lot of topics to sign up to. These contain communities in them. The idea is to populate subscription feeds, however it can leave some users with a lot of undesired subscriptions if they click too many.
If you wish to roll this back. Go to Settings -> Profile and click the yellow bar. Don’t click the red bar!
But welcome, and feel free to post your thoughts here.
!newcomers@piefed.zip for a specific community also devoted to new users to the Fediverse.
Come Join us in the Zulip Chat if you have specific queries.
This is what I use👍🏼
Im going to toss in Summit as well. Really excellent, immensly customizable, steady updates.
As a user of Relay for Reddit, this is excellent. So many of the same features and customisations that I feel right at home already.
And extensive filtering!