How exactly the Power Management dialog work?

It is unclear to me how exactly the settings in the dialog work. I have currently set the following:

  • Suspend session
    What is the third row for? There I can choose between “Standby”, “Hybrid hibernation”, “Standby, then hibernate”. For example, if I would set “Shutdown” in the first row, why these settings in third row when the system is shutting down?

  • Other settings
    Why can I set an action here too that is to be performed after x minutes of inactivity? I already specified something above in “Suspend session”.

Third row I guess defines what “sleep” does.
If you set first row to shutdown then 3rd row should be grayed out because it makes no sense.

Other settings are independent of “suspend” settings.
I think in the "After a period of inactivity " you can run a command or script prior suspend.
And power profile is what it says.

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