Everyone makes mistakes on computers. We need to learn how to do them. Control Z is the way. Most programs have an Undo feature or command. In Windows, it's Control + Z. On a Mac, it's the Command + Z. This tutorial gives you a demo on how to use them. Remember, if you close the program, you won't be able to use the undo feature. Redo is Control (Command) + Y. That'll bring back your last undo.
