Preferences, Keyboard & Mouse
This will show the shortcuts that are setup – you want to find the Keyboard Navigation section.
Under that you will find ‘Move focus to the menu bar’ and see the shortcut key assigned to it.
Note – the shortcut keys are normall F keys (F2, F5, etc…) and won’t work unless you set your f keys to do their normal functions rather than control brightness, volume, etc.
Another great way to do it is to simply hit cmd + ? which brings up the spotlight search
From here, you can simply type the command name you want (i.e. for File, Open, you would simply type Open), and the menu containing that command immediately opens, highlighting the command you just typed.
Once the Spotlight finder is open, you also can simply use the arrow keys to move back over to the left and select the menus you need.
Mac shortcut nomenclature:
^ = Ctrl
Command + Tab = cycle through open applications
Command + Spacebar = open search / spotlight
Shift + Control + Power button = puts all displays in sleep mode
Command + Shift + G = in Finder, opens prompt to go to specific folder
Command + Bracket = command +