I am constantly wondering how to better my game. Although my book is not on swing tips, I just had to share this one. Of course it depends upon your personal swing, but here's what I found out.
My swing plane tends to be a bit steep and I often come down from the outside. I have also been wanting to increase my distance, particularly with the driver and fairway woods I knew that would come from a better turn and weight shift.
Leann, my swing coach, drew a line behind the golf ball, starting close to my body, through the ball and ending up towards the right. In other words, she wanted me to reverse my swing. By focusing on hitting the ball from the inside out, it magically changed two things.
1)I was finally able to shift my weight correctly and 2) Ball after ball went soaring!
As I said, I don't know what your swing is, but try it. It absolutely worked for me!