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Go to next workbook

Windows shortcut 
CtrlTab
Mac shortcut 
Tab

Move to next / previous workbook window.  This shortcut "cycles" through open workbooks each time it is used. To reverse direction, add the shift key.

⌘ ~ also works on a Mac.

Related videos

The videos below demonstrate this shortcut.
In this video, we'll look at how to make a custom table style the default table style in new workbooks.
In this video, we show you how to move a pivot table style from one workbook to another.
In this video, we'll look at how to move a custom table style into another Excel workbook.
In this lesson, we cover shortcuts you can use to navigate workbooks.
In this video, we find your way around a an Excel workbook, and how to see where you are now.