@bbatsov posts a very long list of very useful #Emacs configuration tips. Too many to list, just go read the whole thing.
Incredibly useful.
https://emacsredux.com/blog/2026/04/07/stealing-from-the-best-emacs-configs/

Stealing from the Best Emacs Configs
Good artists borrow, great artists steal. – Pablo Picasso After spending the past couple of weeks updating Prelude and my personal Emacs config, I figured it wouldn’t hurt to see what the competition has been up to. I hadn’t done a proper survey of other people’s configs in years, and the Emacs landscape has changed quite a bit since the last time I looked. So I went through Doom Emacs, Purcell’s emacs.d, Centaur Emacs, Prot’s dotfiles, and a handful of others. Here are some of the most interesting things I found – settings and tricks that I either didn’t know about or had forgotten about entirely.