Ctrl z -the undo typing hotkey
I know everyone, including myself types, and makes a mistake , then wanted it to come back but couldn't remember exactly what you typed. On the keyboard its on both side of the bottom right and left of your key pad (HOLD CTRL+Z) it will UNDO what you typed. Press it individually and u can go back and undo and possible find what u typed. I ALWAYS USE this and is great for editing!
AWESOME AND TIME SAVING HOTKEY!!