Settings Keybindings Explanation

[DGrv]

Hi,

I really sorry to ask such question but I really do not get the meaning of the keybinding settings:

I tried everything to understand what was Win hold and Win switch
Or Invert and Previous App.

But nothing seems "to work", at least nothing is happening.
From my side only left Alt and tab in the App hold and App switch seems to do something.

Thanks :)