Looking for keyboard shortcuts Excel on a Mac

[ovidionasone]

Hi,
I can't seem to find a solution online that works. I use Excel on a Mac and I'm trying to enter the Edit mode to modify the cell references in an existing chart. I think in Windows you use F2 and from what I see online the equivalent on a Mac is Ctrl U.
This doesn't seem to work, and I've set up the FN keys in System Preferences not to be used as the default setting.
Another keyboard shortcut for the Mac that I'm having trouble finding is to cycle through cell reference modes when entering a formula.
If anyone knows of a good reference for Excel keyboard shortcuts on a Mac, I would appreciate knowing.
thanks

[alansidman]

https://exceljet.net/shortcuts

[TMS]

In that link

Cell edit mode
Shortcut           Windows    Mac
Edit the active cell    F2   ^U