- https://www.masteringemacs.org/article/whats-new-in-emacs-31...
See also my reading guide: https://www.masteringemacs.org/reading-guide
My book is of course an option also, but it costs money.
Just get it already
I'm going to go through https://github.com/emacs-tw/awesome-emacs as well as https://www.masteringemacs.org/
https://www.masteringemacs.org/
This provides an excellent base and exploration of the builtin packages, then you can customize your experience on top and make it your own.