Don't be deceived by any invitation to join the stock trading team. Stock trading is to engage in stock trading. The core content of stock trading is to obtain profits through the price difference between buying and selling stocks in the securities market. The rise and fall of stock prices vary according to the fluctuation of the market. The fluctuation of stock price often shows the characteristics of differentiation, which stems from the concern of funds, and the relationship between them is like the relationship between water and ships. When the water is full, the boat is high, and when the water is full, the boat is shallow.