The golf swing is unique to each golfer; however, there are some basics that are true for all golfers. They may be incorporated in different ways, but they are fundamentally based on phyics.
Focus on your balance. Amateur golfers are plagued by all kinds of problems that can be traced to a lack of balance. Place your feet together and take some three-quarters swings. When you feel balanced, hit some balls with your feet together. Make sure you don't step out of the shot. If you master the feet together, try hitting balls while standing on one foot.
Turn your shoulders and drag the club back, extending along the target line, when beginning the swing. A common amateur swing fault is lifted the club with the hand and arms when starting the swing. Doing so creates a very steep swing plane and leads to fat shots, slices and pulls, among other problems.
Take the longer club when you are in between clubs and hold that club about 2 or 3 inches down the shaft. Choking down in this manner will give you more control and, by shorting the club, will reduce the distance.
Swing down to make the ball fly high. In other words, hit the ball at the bottom of the swing, not on the way up. High-handicappers try to lift, or help, the ball into the air. The result is an upward motion at impact, rather than the completion of the downswing. Don't try to dig the club into the ground in an attempt to hit down. Instead, let the club take its normal swing path and bottom out at the ball. It's just simple physics. The loft of the club will project the ball into the air.
Use a longer club than you think you should for all your shots. If you are like most amateur golfers, you overestimate how far you hit the ball and end up short of the green. A longer club with an easier swing will produce better results.