Use Control Z/Undo Liberally
Do not be afraid! Try it! You can UNDO! Master the keyboard shortcut Control Z (Command Z on a Mac). Try a new font, do not like it, Control Z. Accidentally type something in a spreadsheet and it deletes what you had in the cell, Control Z.
Keep On Control Z
In many applications, you can use Control Z multiple times. Control Z the last 5 moves if you need to. When designing a Google Slides I will move elements around and decide I do not like it. Control Z, Control Z, Control Z, Control Z, Control Z.