Welcome to the Cheat Sheets:

As The Wonderstuff nearly said

This one’s a bit niche, but it’s a corollary of the Boostbox and may be useful for the discerning text editor connoisseur or people that want to spend more time in the terminal.

Editor, Email and Multitasking | Neovim, Neomutt and Tmux

I’ve been using Vim for years. It’s a work of art. The problem is that getting the most out of it involves remembering keyboard shortcuts galore. So here they are in pdf and svg formats.'

There’s also a link to an excellent article on setting up GnuPG so that you can manage your identity.