Few things in life match the joy of hitting a golf ball right down the middle of the fairway, without having it hook or slice. Such a shot will not only be satisfying, but it will lead to lower scores--particularly as new courses are being built with longer yardage and narrower fairways. If you can manage to hit your tee shots both straight AND long, you will have shorter approach shots, particularly on the par 4's. Here are things you should think about if you want your drives to be straight.
Do not over-swing. The tendency of many golfers with a driver in hand is to swing it with as much physical force as they can muster to knock the cover off the ball. In fact, nothing contributes more to a wayward shot than trying to hit the golf ball too hard. Strangely enough, you are more likely to hit the ball straighter and farther if you perfect your timing through an easier swing than try to hit the ball hard.
Maintain your balance throughout the golf swing when you hit the driver. One of the biggest causes of big hooks or slices is that golfers do not maintain control of their swings from setup to finish. Most often, this is due to over-swinging, but it also can happen as they compensate for other problems in their swings. All golfers can work on having a balanced swing, but they should seek the advice of professionals if they recognize flaws in their swings.
Avoid over-thinking, and trust your golf swing. Many golfers dwell on various elements of their swings, thereby losing sight of their mission to get around the golf course in the fewest number of strokes. Rather than simply trusting their swings, many golfers try to remember to add or avoid elements to their swings, and they never seem to be successful on the golf course. As the old saying goes, "Dance with the person who brung ya.'" Trust your swing on the golf course, and make improvements to it on the practice range.
Practice, then practice some more. Take the time to make improvements to your golf swing and make them a part of the swing you take to the golf course. Experiment with ways to hit straight drives. For example, try addressing the golf ball in the heel of your driver. You will find that you use your hands less by doing this. And by making fewer adjustments, you will increase the odds of hitting the ball straighter.