Practice swinging setting the club on your shoulder on the backswing and the other shoulder on the follow-through. Swing without tension.
Use alignment sticks to form 90-degree angles on the tee box to figure out how to aim correctly down the fairway.
If you struggle with keeping your hands in the same position from address to impact position, it’s because you start with your hands way too low.
If you tend to slice or hook the ball, begin your setup to the side of the tee box. The golf course becomes more significant when you do this.