Cleary, straight in shots are the simplest, center of the shaft, through the center of the ball, I do not use a method for this one, is all about stroking straight through. I usually do a drill setting up balls from side pocket to side pocket and take cue ball in the kitchen setting up long straight in shots, you get ball in hand in the kitchen after every shot, after 7 or 8 balls you switch pockets. Not an easy drill to do on tight pockets, if you miss you set them up again. Switching pockets can sometimes get you but it will have you stroking straight and staying down on the ball. As for the thin cuts, its the very edge of the shaft to the edge of the ball, you will get the feel of it I believe.