The first thing we can know is that his theory is scientific, not pseudoscience. Steve nison, the author of another classic K-line book, Japanese Candle Drawing Technology, was later defeated by the Nikkei market. I have to say that george soros, who was once called the man who defeated the Bank of England, has also been defeated repeatedly in recent years. Of course, compared with the top two and the overall results, George Soros is very good. The specific investment experiences of Gann and steve nison are hard to find online at present. If we have to say why they failed in the end, then I think it can be explained by the uncertainty principle of German physicist Heisenberg: "If someone wants to clarify the meaning of the phrase' the position of an object', then he must describe an experiment that can measure the position of an electron, otherwise the phrase is meaningless at all." The investment market will always be both sides of the long-short game. The market is ruthless, but people have feelings. People always have their own shortcomings, which is why there will always be success or failure, even if you are constantly correcting yourself. However, market behavior is all-encompassing. You know, even James Bond has made mistakes, but fortunately he has not suffered a serious fiasco (death) yet. From this point of view, it is extremely important to keep a calm mind at all times if you want to succeed in the investment market. We can learn technical analysis well, but unstable mentality, sudden political events and other phenomena will still cause our mistakes, which is the problem of risk control. There is a lot to say in this regard. If you want to know more about this market, you'd better inquire more information.