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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 named constant. This is a useful way to create a name that doesn't appear in a cell on the worksheet.
In this video, we'll look at how to rank values in ascending or descending order using the RANK function. When values change, the rank will automatically update.
In this video, we show you how keep a chart up to date with new data, and how to add new data to an existing chart.
In this video, we'll look at how to use chart styles and colors.
In this video, we show you how to use merge to align text across cells. Merge is easy and works well, but be sure to check out Center Across Selection for an option that doesn't interfere with Excel's grid.