When asked what they see as the primary flaw in the amateur game, they almost always cite course management as the biggest single issue, commenting that amateurs often don’t account for where the trouble is on a hole, or where the best places are to miss, etc.
In other words, amateurs cost themselves a lot of wasted strokes due to defects in the mental part of their game.
Always remember: In golf, it’s not how good your good shots are, it’s how good your bad shots are.
Ironically, it’s often not the quality of your golf swing that determines that.
Much of the time, it comes down to the quality of your thought processes.