What's the name of the place where you got off the plane? The one corresponding to the boarding gate is called the exit? How to ask the stewardess? How do you know where to get off the plane?

Call the cabin door when you get off the plane I think you mean where you left the airport. Domestic airports are generally marked as airport exits (there are multiple exits, represented by numbers).

There is a security door in front of the airport exit. That is arrival (generally divided into domestic arrival and foreign arrival). Just follow the people who get off the plane and you won't lose them. There are only two channels out of the arrival port: one is the baggage claim channel and the other is the baggage-free exit.

Don't ask the stewardess, get off the plane with the big army, and you can't leave if you want to get lost, because many areas are closed and not allowed to enter.