The source provides an extensive guide to mastering golf shaft lean at address, a critical setup component often overlooked by amateur players. It defines shaft lean as the forward tilt of the club toward the target before the swing begins, noting that this positions the hands ahead of the ball. The text emphasizes that proper shaft lean is foundational because it promotes the correct impact position, leading to enhanced ball compression, greater spin, and improved overall shot consistency. The source also addresses common misconceptions, such as the idea that shaft lean only benefits advanced players, and offers practical steps, drills, and checkpoints for golfers to achieve and maintain this technique. Ultimately, the resource aims to show how mastering this fundamental alignment feature can significantly elevate a golfer's performance and ball-striking ability.