A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Your keyboard is not the issue (as long as it is Mac compatible). Mac Excel does not support the ALT key shortcuts used in the Windows product.
Most Mac keyboard shortcuts are shown in the main menus adjacent to the commands they execute. E.g., the keyboard shortcut for Edit> Paste Special is Control+Command+V [^+⌘+v].
Also, note that the available Paste Special options depend on what was copied as well as the source from which it was copied.