Most of the fee-based training is deceptive. What I really want to learn is the technical content. Don't learn theoretical content. Basically, it is the public content of brainwashing, that is, the teaching content that is open on major platforms. Just change some terms or add rhetoric, which makes you feel that you can make money. Then you can't restrain your inner impulse, pay the tuition and fall into the scam of a liar.