What’s the most helpful tech shortcut or hotkey you know?

[uptrendfinancialsignal]

I think the one that saves life every day is CTRL+Z. That undo button is what saves everyone from making silly mistakes. I could even delete some files through mistakes and I can quickly correct them with the help of CTRL+Z. Screenshot shortcuts are another lifesaver that I use almost all the time. But sometimes I don't know why I forget simple ones likeCTRL+C because I have a lot of things going on in my head. Hotkeys really make things fast once you remember them. Which shortcut do you use the most?