My first 'handover' was taking a demonstrator for a test drive . The salesman brought the car to the front and then left me to it with little more than a 'see you later'. Before I could drive off the engine suddenly stopped

(It had gone into EV mode

) Consternation. How do I restart the engine?
Fortunately I soon realised, without the embarrassment of having to ask , that despite the total silence the car will move off anyway when you press the throttle pedal. A surreal experience the first couple of times. But within a few hundred metres I had no trouble driving the car.
Second handover ,delivery of my own car, was not much more than " we've programmed in a few radio stations." ' To be fair, in the 'excitement' of getting my mitts on a new car I probably wouldnt have absorbed much of a hand over briefing anyway.
I have learned most of what I do know empirically from reading the manual and experimentation. I'm often reminded that there is still much I have yet to learn. And some I've already forgotten.