Vim

• Switch case
  ~

• What's a quick way to comment/uncomment lines in Vim?
• https://www.vim.org/scripts/script.php?script_id=1218
  • preservim/nerdcommenter

• Split window
  :split [filename] , :vsplit [filename]
• Switch panes
  C-w C-w , C-w [arrow]
• Hide/close current panel
  :hide C-w c

• Show colours
  :runtime syntax/colortest.vim

—look, I made this: