People, what is the most useful keypad/board button?

honestly, the most underrated button has to be the 'Esc' key. whenever i'm messing around with something on the pc or a program starts acting up, that button is my absolute lifesaver. it just closes whatever junk is popping up without me having to fumble around with the mouse. super handy when you're in a rush.

other than that, the 'Ctrl' key is king. 'Ctrl + C' and 'Ctrl + V' are basically the reason i get anything done, even if it's just copying some info or a quick note. keeps things moving way faster than clicking through menus, saves me a ton of time during the day.