Short lesson. left arm straight,right elbow in,keep your head still.
I like the more philosophical.
The golf swing originates at the earth and moves upward through the body. The hips leading the shoulders and so on. The head glued to the ball the axis which rotation is made. The head is the quiet part both mentally and physically still stuck spellbound to the turf well after contact is made and the shoulders and hips square to the target. And yes the right elbow is nearly welded to the torso. The wrists loose as the club moves in ballistic fashion. It is never steered with the right hand or right side of the body. It is pulled through the shot with the left and an elbow which never breaks with a calm that is as natural as nature taking it's course.
A golf swing can be a beautiful thing. Even more beautiful when a golfer has a grounding in solid technique but then creates their own style and flavor to the movement. A good golf swing is technically correct. A great golf swing is an unmistakable signature that invokes the personality and style of the player. I always strive for quiet loose effortless power and a fluid finesse. True club speed comes far more from timing and flexibility than raw grunt.