If this is your first time on the #Fediverse, the instance (server) that you are on, may not be all that suitable and that is fine. It's OK to change.
Check out https://fedidb.com/ or https://fediverse.observer/ for different servers.
Avoid the 'official' Mastodon servers (mastodon.social and mastodon.online) where possible. Moderation is lacking to say the least.
#Mastodon is NOT the #Fediverse - There are other platforms which have the underlying technology (ActivityPub). Some of those are #Pixelfed, #Sharkey, #Lemmy, #NodeBB, and some applications have plugins/add-ons that enable AP, such as #WordPress