The opening of stock index futures refers to the first time to buy or sell, that is, there are no cows and bears when opening the position, and there are cows after buying and bears after selling. Closing positions is based on opening positions, that is, when you have long positions, closing positions is selling; When you have a short position, closing the position is buying. Open positions before closing positions. For example, a stock is understood as opening a position when it is bought and as closing a position when it is sold. However, stocks are only bought, and futures are still sold, so for futures, in addition to buying and opening positions, there are also selling and opening positions.