How can I use knowledge of the learner to be a better teacher?

Knowledge of the learner is essential for an educator to do their job effectively. It was Tiana's class that really drove home the importance of the student in the learning process. She made very certain to stress to us in every part of that class that the student's needs must come first if the learning process is to be successful. I don't know that there's anything more that I'd like to learn about it. I just think it's something that needs to be stressed constantly.