I have recently have been watching YouTube videos on keeping the head from shifting back in the backswing. I never thought I did this, but when I actually focused on doing this, I could feel a definite difference. Mostly, I felt more pressure on my lead foot and greater depth of my back shoulder. Do you recommend this and if so, what should the foot pressure feel like?

I'll start by saying that players tend to use the ground differently in terms of shifting and loading patterns and they vary for a lot of reasons. I can tell that almost every player on tour has head movement in both directions. Simple pressure shifting from one side of your body to the other is a fundamental element of proper rotation mechanics. The easiest comparison I could give you of this is throwing a ball. When you throw a ball, you are going to load pressure into the trail foot as you load up and then there is the step and throw motion. The golf swing follows these same biomechanics. Keeping the head still is not a viable fundamental in my opinion. It limits natural movement patterns that you want to engage in your swing. To understand more specifically how to apply these concepts to yourself, I would want to see a video of your swing if possible so I could give you some more specific advice.

Thanks Casey. Makes sense. On the downswing, I would figure the same is true to a degree.

Check out the pressure shifting module in the full swing fundamentals section. There are also drills for pressure shifting under the full swing drills section. This should help further clarify this topic for. I'm always available if you questions beyond that as well!