Of course it's impossible to outline in writing all of the ins and outs of how an individual goes about learning the perfect technique for oneself, including an awareness of what is right and wrong with one's motions and approach (when they are happening).
But, there are some pointers, and technique from the physical standpoint is fundamentally connected first to how a person sits on the bench, and that in relation to a person's ability to know what it means to be balanced and centered, and what it means not to be. Both parts are necessary for playing, but it's important to know when and why. Extending out from there are principles about movement and motion, and while it's important to learn when to use "more finger than arm" or "more arm than finger," the truth of the matter is that one is *always* affecting the other in some way, and the largest aim is to have them -and your whole body- working harmoniously together (= smooth, efficient, non-constrained, musical motions) vs. parts of the mechanism inhibiting other parts in any way. This takes some serious exploration and investigation with specific aims.
Let it be a given that any part of the mechanism should not be "static" ... if it is 'still', there is a difference between being balanced and supportive vs. being static (let's say that "static" here means resistant to any type of motion). Other than that, for this tiny snippet of a post about this subject, just explore for motions that don't hurt, experiment with arm motions that are way too big, or too small, and find what makes your goal achievable in the most pleasant for you way at the time, all the while knowing that whatever you arrive at will most likely grow, change, and develop over time, as well. But, the right idea can support development!