@Pilot DAR; that is a very comprehensive set of questions about carb heat - wow !
I could not answer all of them despite 20 + years of aviation experience ! (Mostly gas turbine aircraft admittedly).
But the OP not knowing what carb icing is does not make them bad or stupid; When I was little my Dad would sit me on his lap and let me steer the car along the farm-track we lived on, while he did the gears and pedals. When I was slightly older I read books about how cars worked, including electrics, the engine, gearbox, brakes and choke etc. and probably knew more about the technical side of cars than many drivers do.
But I could not drive. When I was older, I was allowed to drive the car by myself along the track, but I was still not a legal driver and had no appreciation of speeds above about 15mph or how to negotiate traffic flows, signalling and the legalities and hazards of driving on the roads. But I was and am keen on driving and my technical knowledge helped inform me when I did pass my test and became a legal driver.