Understanding basic swing concepts is the number one key skill in a golf swing. It is universal across all sports. How the trail arm lines up with the club, racket, Bat or stick is the same. The value of this skill is monumental in achieving maximum control and force into the ball. That is what creates your potential ball speed. In golf it starts with the putter but works on chipping pitching and with the driver. It should be the first and most important skill in the golf swing. Most every thing should be built of this task.