Adam Young is one of my favorite writers, bloggers, podcasters on golf (check out The Sweet Spot podcast, cohosted by Adam Young and Jon Sherman). I'm also reading Young's longer book, The Practice Manual, a must-have resource for serious golfers covering impact mechanics, motor learning, the mental game, strategic ways to practice, and more. Golf Hacks is a short ebook that introduces golfers to Young's basic concepts. I've found these more helpful than anything else in improving my game. Highly recommended.