Want to really build your shortcut knowledge? Excel training site Exceljet offers this handy page of about 200 keyboard shortcuts for both PC and Mac.
The shortcuts list covers everything from file management to formatting and editing data. Some keyboard shortcuts are Windows-only, some are the same for both OSes, and some are quite different between the two platforms...which makes this page really worth bookmarking (or printing) if you use Excel on both Mac and PC or are thinking of making a switch from one to the other.
Exceljet also has several free Excel training videos worth a peek.
Excel PC and Mac keyboard shortcuts [Exceljet]