how do you undo your last thing as i have made a mistake
Ctrl+Z is the magic.
Ctrl+Shift+Z is the Redo, just if you wanna make the mistake twice.
Yup, what Pat said. Ctrl + Z is used in many programs to undo something, like in photoshop, gimp, microsoft word. It’s the universal undo hotkey!
Ctrl+Y can redo too