@roodleypoodley The about page has pretty much all the details about what the various interfaces mean. But if your coming from twitter you might want to check out our halcyon: https://halcyon.qoto.org which is an interface you can log into and it looks like an exact copy of twitter but its the QOTO network.
The other thing you might like is https://video.qoto.org. It is a youtube-like app that uses the same standard as the social media network. So anyone on the network can follow your video account and see yoru videos posted right into their feed when you post them.
We also have a few other servers your welcome to use that use ActivityPub just like the video server but for different purposes. Like we have a nextcloud instance which replaces google drive: https://cloud.qoto.org