To hit your ball far and straight, you need to swing your club fluidly on the proper plane. More important, you need to swing your club full tilt, squaring the clubface to your selected target. To do this, you need to have control of your club during the swing. And to this end, you first need to grip your club properly.
You cannot square or slightly close your clubface through the shot without gripping your club correctly. Once your swing starts, you cannot control your clubface easily. You need to put your hands in position to control your club effectively before you start.
Hold your club lightly in your fingers. Holding your club in the palms, you cannot hinge your wrists freely and fully. This restricts your swing speed. Similarly, without relaxing your hold, you cannot swing your club fluidly.
Tightening your grip means brute strength. To purge your swing of brute force, you need to loosen your grip. Gripping your club softly, you will hinge and unhinge your wrists fully to increase power to your maximum. If you create enough power, your instinct says you don't need to use brute strength.
If you have tension in your hands and arms, you will incur diverse unwanted shots. After all, when your swing turns sour, your first emergency action needs to be examining your grip and grip pressure.
To grip your club properly, make sure the heel of your left hand sits on the top of your club handle. You need to place your club handle under the heel pad of your left hand. That allows you to hinge your wrists properly and freely throughout the swing.
Also, let the pad of your thumb rest on the right side of your grip. That helps you place your wrist square to your clubface. This is critical to sending your ball straight, or rather keeping your slices at bay. Ignore the markings on the center of your grip when you grip your club with your left hand. Don't use them as the guides for your left thumb.
More important, press your left thumb toward your forefinger so there is no space between the two fingers. That helps you grip your club firmly or securely, preventing your club handle from slipping during the hit.
As for your right hand, you need to hold your club in your fingers. Also, let the V created between your right thumb and forefinger point toward your right shoulder. Or, let the palm of your right hand face the palm of your left-hand.
Also, you need to avoid holding your club dominantly with your right thumb and index finger. Take care to grip your club with your ring and middle fingers of your right hand.
To grip your club properly, stand in front of a life-size mirror. Let your arms hang naturally from your shoulders. Now, picture that you are holding an egg as you ball your left hand into a fist. Check how many knuckles on your left hand you can see.
If only one of your four knuckles is visible, let the V formed between your left thumb and forefinger point toward your right ear. If you can see two knuckles, let your V point midway between your right ear and right-shoulder tip. If you can see three knuckles on your left hand, let your V point toward the tip of your right shoulder. If four knuckles are recognizable, let your V point toward the tip of your right shoulder.
That way your left hand will return properly to leave your clubface square to your target when you hit your ball. Remember your grip needs to vary depending on how your left hand is hanging from your left shoulder.
Make sure the natural position of your left hand matches your clubface position when you grip your club. That will ensure you hit your ball far and straight toward your intended target. Granted, to let your left hand return to its original address position, you need to grip your club lightly but firmly.
Turn your left hand a touch right or left on your grip from your natural hand position. That will help you enjoy hitting beautiful fades or soft draws.
When you hit with your driver, adopt a slightly stronger grip. A strong grip promotes draws. With a consistent draw, you don't need to worry about your right side of the fairway.
If your finish feels restricted, you need to loosen your grip. If your grip pressure is right, you will finish your swing with your club wrapped around your neck.
Also, grip your club more lightly if you cannot keep your head steady behind your ball at impact. Too tight a grip forces you to lunge forward. Your body and arms will bunch up to move forward ahead of the ball before you hit it.