✨ Some Handy Diagrams! ✨
Good news, you can totally ignore these if you want, it's only if you're curious about the technical stuff behind the scenes.
Here's the diagram I made in 2017 that explains what ends up in your local and federated timelines (and how): https://commons.wikimedia.org/wiki/File:Mastodon_timelines.png
I'm attaching it here, along with a French one and an Italian one that others translated themselves.