Staying down through impact- easier said than done. It is one of the major reasons I put the downunder board to work with my students. To stabilize the pelvis and leg motion.
Scottie Scheffler's footwork has become a talking point in golf due to his success. I know it's a great ground reaction force, many talk about it as if it is a swing fault. Watch and learn.
Slotting the club behind the body is a tough a thing to do for mist golfers. Visually the club feels too far behind them. That's why there is a method to the learning of the drills in an order that works. Watch the slot become better on this student in this video.