I’ve forgotten many of the keyboard shortcuts so easiest way to usually find them is to hover the mouse over a button and read the tool tip.
Couldn’t remember the one for changing Edit Step up/down so I hovered the mouse there and there is no shortcut shown. A bit of experimentation trying to find/remember it and I noticed I’ve changed octave. Hover over the button to change octave down and again no keyboard shortcut shown.
Now these can be found through going into Preferences -> Keys (and has shown me the nice double/half Edit Step I didn’t know about) so can still be found but most other Tool Tips have the keyboard shortcut if there is one. May be more than these two areas I have noticed missing it but they are all I’ve come across so far.