That’s a big request considering OAuth 2.1 came out a while ago and despite it being a “minor,” version bump is probably more like a major… encompassing over a decade of addendums and errata to OAuth 2.0!

Good summary of 2.0 ➡️ 2.1: https://dev.to/pockit_tools/oauth-21-is-here-what-changed-whats-deprecated-and-how-to-migrate-your-app-ah3

And OAuth 1 ➡️ 2, from the source: https://www.oauth.com/oauth2-servers/differences-between-oauth-1-2/

The RFCs are a great resource.