Vim has become my go to editor; though I'm laughably "bad" at it. (e.g. I still use the arrow keys, etc) — I suppose this could be a bit of encouragement, don't worry too much about being hardcore, you can actually have a go at it "incrementally."

Spoiler: you quit with ESC and then
to leave without saving or
to save ☺

List of Vim-Like tools
Reddit thread with lots of links to Vim-like tools.

Backlinks: LibraryZim:Command Line LibraryZim:I use this LibraryZim:Library