There are so many sneaky cool ones that get half forgotten because I don’t use them in my workflow enough.
But, for me, I would recommend starting with - C (cycle range on/off) A (automation view) R (record) and ctl M (mute - which I’ve changed to just M). CMD , gets you into your global preferences to fiddle around with your audio buffering etc. CMD b to bounce and CMD q to turn off Logic and go to sleep.