For discoverability I love using helm with M-x (or SPC-SPC). I just think of a function I might like to call, like "git fetch" or "sort lines" or "render latex inline" or anything else, and pretty quickly I can figure out what it's called and what its shortcut is for next time. I take for granted that it exists.
Helm is great and I still use it occasionally even after I recently transitioned to using orderless, marginalia, consult, vertico, etc. for most things like that. C-h b has become my recent goto for inspecting the keybindings on various modes; I used to do C-h m, but the new interface of describe-bindings is neat.
