The first level is to predict the ups and downs. The second level, basic technical analysis. The third level is the investment concept. The fourth level, the rules of the game. These four levels are higher than each other, but in fact they are clear: as far as the rules of the game are concerned, they can be found on the websites of major exchanges; Everyone knows the investment concept of the third level, which is nothing more than homeopathy, stop loss and fund management. As for the lower-level technical analysis, there are many things to write, covering various K-line patterns, bull-bear market cycles, indicators, wave theory, fractal theory, Gann theory and so on.