Quick, clean, and to the point

Repeat last action

Windows shortcut 
Mac shortcut 

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.

I think your website is great! It has helped me so much in learning to how to do things in Excel, please keep up the excellent work. -Stuart
Excel foundational video course
Excel Pivot Table video training course
Excel formulas and functions video training course
Excel Shortcuts Video Course
Excel Charts video training course