Master Wang's food teaching CDs are all sold on his own official website. Don't go to some phishing websites. Besides, watch the videos. Master Wang's food teaching CDs have been verified by practical training. Every detail of the on-site operation is very detailed, just like the face-to-face effect, and they are put on record. They are published by the publishing house. They promise that if they can't learn or feel bad, they can apply for a refund. You can also call and ask.