Hashtags are the main way to find posts and discussions on Mastodon and the Fediverse. Here are some interesting tags you might want to check out:

#BreadPosting
#DogsOfMastodon
#Caturday
#MastoArt
#Florespondence
#Sporespondence
#Mosstodon
#Lichensubscribe
#SmallStories
#TootFic
#SFFBookClub
#AmReading
#AmWriting
#Introduction
#AskFedi
#NowPlaying
#BandcampFriday
#VendrediLecture

In case you missed it, you can also follow hashtags on here, more info at https://fedi.tips/how-to-use-mastodon-and-the-fediverse-basic-tips/#HowDoIFollowHashtags