Quickly undo mistakes in the majority of Windows programs by pressing the shortcut key CTRL + Z. For example, if you mistakenly cut or deleted text in Microsoft Word pressing the CTRL and the Z key at the same time would undo that change.
Most Windows programs also support the ability to undo multiple changes. Continuing to press CTRL + Z will undo one change at a time often back up to 12 or more changes.
Redo the undo
If you undo something you did not mean to undo pressing CTRL + Y will redo the undo.