You don't learn to play corner over-night. Playing that position is one of the toughest to play in the league, IMO.
Not only do you have to be fast, quick and instinctive, but you have to be able to jam the receiver, then jump right into character - You can't fall for every twist turn and stop, it could be a fake - when the ball is in the air, you have to turn your head, while keeping your player next to you and make a play on the ball.
Then you must tackle - know how to play zone - WRs tendencies individually - There is way too much to learn, outside of the talent alone..
But thanks for playing.