ShortCut Diagram - Need Clarification

Opus 12.24 short Cuts.
Shift+p = Pin/Unpin topic. Very easy to figure out.
g,h = Home (Shift, Control, Alt) not sure on the action.
I downloaded the Short Cut diagram. Is there a descriptive file that goes with it?
Bob

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Those are the forum's keyboard shortcuts. They don't do anything in Opus itself.