Some talks I've given on fediverse stuff over the years:

Social Solutions to Social Networking, about cool stuff you can do when you're not scaling a huge platform - https://videos.theconference.se/darius-kazemi-social-solutions-to

Trust is Not Harmful, about what we mean when we talk about trust and "trustless" on fediverse vs web3 - https://vimeo.com/354276253

Squishy Amoeba-Like Objects, about topology of federated communities - https://www.youtube.com/watch?v=qxBu5Tktm1g

The first video is probably the most "intro for a general audience" of the three.