Quick, clean, and to the point

Undo last action

Windows shortcut 
Mac shortcut 

This shortcut will allow multiple levels of undo; each time you use it Excel will step back one level.

Related videos

The videos below demonstrate this shortcut.
This video shows how to stop Excel from changing cell references when you want an exact copy of a formula in a different cell.
In this video, we'll look at several ways to to enter Excel functions.
In this video, we show you how to quickly remove all borders and fills when you want to start fresh. This is a good idea when you've inherited a messy worksheet.
In this video, we'll introduce the idea of a dynamic range and show you why you might want to use one. Spoiler: they adjust formulas automatically when data changes.
In this video, we'll look at how to several ways calculate the number of days between dates. To get started, let's first first set up some dates, so we have a visual representation to refer to.