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.