Practice your balance first, and then move your feet after you are on an even footing. If it is difficult to move both sides at the same time, you can learn to move one side first, then learn to move the other side, and finally combine them to perform the inner and outer movements. Your current stage is to find a small slope and slide down it. During the process, the center of gravity is centered on the back foot and the front foot is moved; or the center of gravity is centered and the back foot is moved. Bend your knees.
Anyway, watch the tutorial~Go to Tieba~