Vim hasn't been mentioned. It's right in the program. It's got a tutorial, a userguide, a reference manual. Stuff is hyperlinked. Follow link with Ctrl-] or dou

Vim hasn't been mentioned. It's right in the program. It's got a tutorial, a userguide, a reference manual. Stuff is hyperlinked. Follow link with Ctrl-] or double-click, go back with Ctrl-t. You can seek help on specific things like options (:h 'ai'), commands (:h :s), normal mode commands (:h w), insert mode keybindings (:h i_ctrl-r), command mode keybindings (:h c_ctrl-f), vimscript functions (:h getline()), etc. The text itself is also well written. It's clear and doesn't feel lacking in detail.