This is the first of several posts where I give my thoughts on subjects you requested.
Footwork is mostly a diagnostic tool that can tell you something bad you are doing. It is not something you can force to be good…it is a result, not a cause.
For instance, if you rotate too far to the inside, that will make you roll on the outside of your back foot, because of the extra twisting of the body. If you upper body moves too much laterally in the back swing, you will also roll on the outside of your back foot.
If your right foot is too flat for too long after impact, you aren’t rotating properly.
I could go on for an entire book. What is important is if you start balanced in the setup, good footwork and bad footwork will tell you something is going on in your swing.
Feel free to ask any questions about some footwork issues you may have and I can suggest a couple of issues that would cause that.