Who doesn’t want to boost their productivity in AutoCAD! Autodesk has made available 150+ AutoCAD Keyboard Shortcuts on this page with printable version of all shortcuts and a template for keyboard stickers. From A as in Arc to ZIP that runs ETRANSMIT (can created zipped transmittal packages). Personally I always change C from Circle to Copy.
If you want to add or change keyboard shortcuts most of them are found in the PGP file that you easiest can access using Edit Aliases on the Manage tab.
Or the Command Aliases command on the Express Tools tab. (Requires Express Tools to be installed)
When done it can be needed to restart AutoCAD or run the REINIT command and select the PGP File checkbox.