Imagine when playing that your body is a belt. If your feet are in the wrong position, or if your grip is off, then it affects everything in between. If your foot positioning and grip are both correct, then like a belt that's been straightened, everything in between falls into place. Isn't that a great analogy?
As a coach, I've noticed that most technique problems come from improper foot positioning or grip problems, although many players (and some coaches) often treat the symptoms instead of the root cause. When you fix the root cause - often the two ends, i.e. the foot position and grip - the rest often falls into place. Not always - longtime problems with foot positioning and grip can create bad habits, and they can be hard to break. But getting the two ends right is a great step in that direction, and one of the top priorities with new players so they develop good technique from the start.