Reading greens, particularly on putts with a lot of break or slope, is all about speed. "Most amateurs tend to underread putts, meaning they don't play enough break and often miss on the low side of the hole," Johnson says. "The faster the putt, the more it breaks."
Study the putt from multiple angles: behind the ball, behind the hole, from the side. Now envision a clear track you want the ball to follow and take a few practice strokes while looking at the hole. Your last look should be to the point where you want the ball to roll. Don't pussyfoot it. As Johnson says, "Commit to your read!"