This is a mammoth work. Contains all short cut keys published by Microsoft and also all ALT keys which are not published by Microsoft.
Download it from Excel - Shortcuts Bible
In Excel 2013, we have a new feature called Quick Analysis Tool. If you select a range and press CTRL, you are presented with Quick Analysis Tool. It offers various commonly used functions which you can perform.
Few people don't like this. To disable it permanently -
File > Options > Uncheck the Red Zone