The external principle of the step is wave-like. Feet are often likened to two fishes.
The figure shows two right steps forward, the right female step (I.) and a the right male step (II.).
Female step (I.): The left wavy line shows the left foot and the right wavy line shows the right foot. The left foot carries weight and the right foot is free.
Male step (II.): The left wavy line shows the left foot and the right wavy line shows the right foot. The left foot carries weight and the right foot is free.
Try to derive left steps and steps backward.