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Undo last action

Windows shortcut 
CtrlZ
Mac shortcut 
Z

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.
In this video, we'll look at how to create a dynamic named range with a Table. This is the simplest way to create a dynamic named range in Excel.
In this video, we show how to use the TEXT function to call out assumptions in a model. You can use the same approach to highlight assumptions in any spreadsheet.
In this video, we'll look at how to create 3D references, an elegant way to analyze multiple worksheets with simple formulas.
In this video, we explain the concept of a absolute cell reference, an extremely important concept in Excel formulas.
In this video, we'll look at how to build a chart with multi-level axis labels. A multi-level axis allows you to group related information together.