We've had quite the influx of new users on Mastodon recently. Welcome to you all! Here are some links that you might like to explore if you're new here, or if just want to know more about how Mastodon works.
1. Resources for Mastodon newbies:
https://github.com/nolanlawson/resources-for-mastodon-newbies
2. An Increasingly Less-Brief Guide to Mastodon:
https://github.com/joyeusenoelle/GuideToMastodon/
3. Mastodon User's Guide
https://github.com/tootsuite/documentation/blob/master/Using-Mastodon/User-guide.md
4. How does Mastodon work?
https://kevq.uk/how-does-mastodon-work/