Command turns letters into actions
⌘C⌘V⌘X⌘Z⌘S⌘A⌘F⌘PPressing Command will not give you more command over your life. Your Mac is another matter.
On its own it does nothing at all. Held down with a letter, that letter stops typing and starts doing: copy, paste, undo, save, select all, find, print. Learn this one key and a hundred shortcuts come free, because they work the same way in every app.
▶ Exercise · 30 seconds
Open any app with text in it. Select all with ⌘A, copy with ⌘C, click at the end and paste with ⌘V, then undo it with ⌘Z. Four keys, ten seconds.