Chinese hamburger is a common snack in Shaanxi, and so is cold rice noodles. If they are in Shaanxi, they should be true. This technique is not difficult, but you'd better go to the store to learn. If they don't have a physical store, they may be liars. If they do, it is estimated that 80% can learn the real technology. And if you go to study, the tuition fee is more than 5000, I suggest you don't go. 100% is cheating on tuition. Teach them. Below this, you can consider it. If it exceeds, it is not worth it. I'm in business myself. I am in Shaanxi. The above is for reference only. You'd better visit it yourself, so it's foolproof. If it is really inconvenient, you can ask them to provide photos of students. If there are many, it shouldn't be fake.