Want to know whether the K-line works? Let me tell you where the K-line came from. Because there is a deal first, there is a deal price. In a certain period of time (for example, five minutes), there are opening price, highest price, lowest price and closing price. This generates a five-minute K-line. It is a tool to analyze the price trend, such as a kitchen knife. Cut vegetables when used well, and cut your hands when used badly. Others cut people with kitchen knives. The reason is the same. If you have just entered the kitchen as an apprentice, it is inevitable that you will often cut your hand with a kitchen knife. Once you become a chef with 20 years' experience, you will enter the realm of scar.