How to learn to play tennis?

There is an amazing lack of understanding by coaches and not only ours of what is actually happening on the court and a complete lack of knowledge of what the inertial force of a moving body is. So, exiting, running out to the point of impact after a step is 2-3 times easier than stopping the body after an impact, and returning to the starting point is 3-4 times harder. If you combine physical training with technical training, then the rubber should be suspended on the opposite side.