Since there's a lot of new people, here's a primer:

This is mastodon.social, hosted by me. We have a code of conduct:

https://mastodon.social/about/more

mastodon.social isn't the only Mastodon server. There are interest and region-specific servers with varying rules. Browse all servers:

https://joinmastodon.org/#getting-started

To learn more about how that works:

https://docs.joinmastodon.org/usage/decentralization/

First steps with Mastodon:

https://docs.joinmastodon.org/usage/basics/