Autodesk Revit shortcuts are meant for improve output by using predefined keyboard shortcuts or adding together to your own key blending.
One tool may have various keyboard shortcuts allocate to it. Some keys are kept reserved and cannot be allocate to Revit tools.
For tools on the ribbon, it is the: the application menu, or Context menus, keyboard shortcuts display in tooltips. (If a tool has multiple shortcuts, only the first shortcut displays in the tooltip.)