Personal experience is to earn the difference by buying and selling stock index futures through bullish/bearish markets. At the same time, I will also communicate with some investors. For example, I often exchange views with other users in Futu Niu Niu circle. The brilliance and software I used before were not very easy to use. Futu's recently launched stock index futures are good. The most important thing is that there is a free Level2 market, and you can see ten buying and selling quotations. Sometimes it really depends on how many quotations you can see before you can change the order.