Stock index futures are the points where stock indexes are bought. For example, the Shanghai and Shenzhen 300 index futures. To put it simply, if you look at how many points the Shanghai and Shenzhen 300 Index will rise in the next few months, you will be long, bearish and short. It avoids that stock trading can only buy up (make money by going up) and can't buy down (make money by going down). Of course, this lever is relatively large. Just like futures, you only need to pay a certain percentage of margin, such as 20%. You can actually buy five times the quantity. The risk is greater.