Muting and blocking are really important tools on Mastodon. They let you choose what you see and who you interact with.

To mute or block someone, go to one of their posts or their profile page and click ⋯, then select "Mute" or "Block".

Mutes hide someone from you without them knowing, whereas blocks totally cut off contact with an account and prevent interactions.

I've done a guide all about mutes and blocks on Mastodon which answers lots of questions:

➡️ fedi.tips/blocking-and-muting-

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If you have a fediverse account, you can quote this note from your own instance. Search https://social.growyourown.services/users/FediTips/statuses/115617822400573893 on your instance and quote it. (Note that quoting is not supported in Mastodon.)