1) Swing tempo
Many players start the downswing with too much force in order to hit the ball hard. Instead, look at Ernie Els's swing, an acceleration of  clubhead speed through the impact area. This will ensure greater balance and a better release of the clubhead. 
 Ernie Els

2) Footwork and balance
When hitting an iron it is important to shift your weight to your target side early in the downswing. 
More and more PGA tour players,
Patrick Reed and Bubba Watson being the obvious ones, are keeping the weight of the lower body longer on the non target side when hitting the driver. Why not try it and see if it works for you.

4) Sequence: 
In order to create a swing that repeats itself make  sure you establish the right sequence of the golfswing. Start  with a 1) full shoulder turn taking 2) the weight to the non target side. Your first priority in the downswing is to 3) move your weight back onto your target side and continue 4) turning the hips out of the way. 5) Your arms and hands will follow and are ahead of the clubface through impact .   
taking a divot
maintain your wrist set 
3) Quality of striking the ball: It comes as a surprise, even to low handicap golfers, to learn that we strike the equator of the golf ball on and around the sixth groove from the bottom of the clubface. In other words we need to hit down  on the ball to achieve maximum ball flight with each club.
6) Chipping and pitching: the difference in the two techniques is how much wrist break you use in the backswing. The more you set the club in the backswing the higher the ballflight. 
For a proper chip and run keep the arms and hands in a straight line.  
Maintaining the wrists:  A problem often seen by a short pitch or chip shot is the player releasing the right hand before the clubhead gets to the ball. In order to achieve the best compression onto the ball pull the hands through and hit down on the ball. Maintain your wrist angle throughout the shot.

PlayBetterGolf - Golf Tips
Dustin Johnson
5)  Left wrist set:
During the back swing pay more attention to your left wrist. The ideal position at the top of the backswing is for a flat wrist. This will keep the club head square. It gives you great confidence and encourages for a faster release through the ball.
Slicers often play with a cupped wrist, the very opposite of Dustin Johnson's bowed wrist.