A small but I think valuable piece of advice for new folks coming from twitter.. Make frequent use of mute, block and report.. there are no algorithms here that decide what you do and do not see, you curate your own experience.
instance (server) admins in general want to provide a welcoming and safe place so will usually investigate and respond to reports.. but are usually volunteers etc. We miss things if we are offline.
Also, if you didn't arrive en masse as part of a semi-organised movement and are not sure who to follow etc. check out trunk.. https://communitywiki.org/trunk
Take your time to get used the differences between here and twitter.. there's no rush ;)