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Repeat last action

Windows shortcut 
F4
Mac shortcut 
Y

This shortcut will repeat the last action again, when available. For example if you just applied a border and red fill to one cell, you can use this shortcut to apply the same formatting to one or more selected cells.

On Windows, you can also use Control + Y for this shortcut. You can add the "Repeat" command to the Quick Access Toolbar to see when an action can be repeated — when it's possible to repeat an action, the command will highlight and become available.

On a Mac, the number of actions that can be repeated is more limited.

Related videos

The videos below demonstrate this shortcut.
In this video, we cover shortcuts you can use to undo, redo, and repeat actions.