Looking at it in more detail, it’s not really a good cheat sheet. It gives you some commands you’ll never use in practice (or shouldn’t), like -Sy and -Syy, and it omits others. Also yaourt is very old and mostly deprecated, and has nothing to do with pacman (it’s a separate program, a pacman wrapper and AUR helper, the predecessor to yay).
If you want a better (though still not perfect, I wish I could edit it, but it’s an old post) cheat sheet, here is this: