When you check your baggage in and get your boarding ticket... (please READ and HELP)?

Question

Then go through airport security, do we have to check in at the desk by the flight's gate? or you already get checked in once your luggage is checked in?

Answer 1

Once you have a boarding pass in your hand, that has a seat assignment on it, you are checked in.  You shouldn't have to check in at the gate again.

Answer 2

Once you have your boarding pass, as far as the airline is concerned you're checked in. When you get to the gate, you just wait around in the uncomfortable chairs until they tell you to get on the plane.