You can prove this yourself by getting on a large weighing machine like they have in a chemist's shop. Wait until the indicator stops and then start moving your arms. You will see that the indicator swings up or down. The quicker you move your arms the faster the indicator will swing. You have to make rapid decisions and reactions when dribbling, but the movement must have a certain rhythm.
Every opponent has a weaker side.
This is usually the side of what is called the weak leg. If he is left handed, his right leg will be the weak one, and vice versa. He will have more difficulty in intercepting the ball with what is called his weak leg, but even more if that is his support leg. It would be impossible to give you a list of all the different ways of feinting, tackling and dribbling because the possibilities are endless. But there are still a few more rules to observe.