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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.
This video shows how to stop Excel from changing cell references when you want an exact copy of a formula in a different cell.
Although the formatting tools in Excel are easy to use, applying formatting manually can quickly get tedious. In this video, I'll show you how to use a tool called the format painter to speed up manual formatting.
In this video, we’ll set up the FILTER function with two criteria.
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 a line chart in Excel to plot historical, 30-year mortgage interest rates.