Proper ball position is critical to well struck golf shots. For full shots I have a very basic system. I call it the 3-ball method.
Start with three balls place the first in the middle of your stance, then the second ball one ball over and the third one more ball over to the left. The rule of thumb is that the ball in the middle in your stance should be the proper position for your lower irons, say 7 thru the wedges, the second ball for your mid irons, the third position, just inside your left heal works great for the woods.
You want to catch the ball before the clubhead reaches it’s lowest point by setting the ball just before where the club makes contact with the ground. This will ensure solid contact and you’ll avoid hitting “fat” or thin shots.