 gap scheme, how to make defenses move by alignment, what to take when the defense gives you this. And then even from the opposite side of the ball is, how do we match defensively? How do we match our personnel to what they're doing? How do we match our defensive personnel to our offensive personnel? Are we a better man team? Are we a better zone team? How do we take away certain things? How do I break down film in order to determine what the offense wants to do with us? And those are all things that he taught me.