After catching the ball, I didn't dribble, so I made a two-step layup. Is this a walk?

Catch the ball, take two steps without dribbling, and the layup is walking. When you catch the ball, you can use either of your two feet on the ground as the center foot, and the other one can move, that is, you can take a step. If you take two steps, the central foot will move, so it will be judged as walking. The official term is dribbling.

Go, China rules generally call it illegal to take the ball. It means that when a player holds a live ball on the court, one foot or both feet illegally move in any direction, which is beyond the limit stipulated by the rules.