Certainly! Post is a straight arm, similar to what a running back would do to keep a defender off of him of he was running around the end of the line in football. It is useful in two ways. The first is when someone comes at you when you are moving in a building. Like when you are going after a bad guy his wife or mother usually attacks you so you stiff arm her and keep moving. Frame is blocking them with your fire arm instead of your hand. So now instead of having them at full arms length they are just at elbow length. Similar to clinch range in Must Thai. Hook and head control is either an under hook or an overlook like in wrestling. Imagine your shoulder up under their armpit. And your forehead controlling their chin. Does that explain it well enough?