Think about the rounds you have played in your favorite foursome or in your league. The guy that plays the best each week might not be getting off the tee the best, but he is making the putts on the green and saving his pars left and right. It seems like he should have had a few doubles, but he didn't because he kept making putts.
The best way to learn to do this is to practice with a pitching wedge and swing it back until your left arm and golf club form an angle that would represent the letter 'L.' In this position your left arm would be horizontal and the golf shaft vertical-although it would point towards the target line.
This is golf in its most pure and simple form just as it was meant to be played. Have you ever noticed how much fun the little ones have at hitting a golf ball? How many golf lessons do you reckon they've had? How many instructional books or golf magazines have they devoured?
Another tip is to drink plenty of water prior to starting your round. Drinking water optimizes muscle performance and helps digestion while playing. Don't overlook this one! Dehydration can cause muscle weakness, cramping, and energy loss - and you don't even know why you feel so tired. Often its due to dehydration. Once you start playing, you should continue drinking water at every hole.
Another mental error that most golfers make is that they play too much to where the pin is and that is not helping them at all. Most professionals will tell you that they play for the center of the green most of the time and when it gets really close it was actually a mistake. This is because the more greens you hit the better chance you have of making some putts and keeping your scores low.
Remember that it's easy to just swing away without really thinking much about what you're doing. But consider that the golf clubs only real purpose is to achieve a sound impact and you will realize the importance of swinging your golf club on its correct plane angle.