On a mac if you want to undo the last thing you did select CMD and Z
If you change your mind and want to do it again select CMD and Y…
….Except in Adobe Photoshop, where CMD Z undo is just the last action…
To go back further it’s CMD ALT Z (step backwards) and CMD SHIFT Z (step forwards)
On a PC use CTRL instead of CMD
Who does this?
Anyone who doesn’t want to keep selecting Edit>Undo