If you reach the platform when subway car doors are closing, don't try to keep them from closing. If you can't find a seat, hold onto a railing. For your safety, please don't lean against the doors. Off Operators make announcements to tell you the next stop along the line. To be sure that you're going in the right direction, you can look at a map.
Every subway car has a map posted on the wall.
When the train reaches the station you want and the doors open, step carefully from the train onto the platform. Then follow the signs toward the exit. In most stations, you can exit by walking through the turnstiles.