The main force refers to the main force, generally refers to the banker in the stock. Opening a position, also known as opening a position, refers to the new purchase or sale of a certain number of futures contracts by traders. In the stock market, the meanings of opening position, closing position and holding position are the same as above. Simply put, these three meanings are: buy, sell and continue to hold shares. The whole process of futures trading can be summarized as opening positions, holding positions, closing positions or physical delivery. Buying and selling a futures contract in the futures market is equivalent to signing a forward delivery contract. If traders keep futures contracts until the end of the last trading day, they must settle futures transactions by physical delivery or cash settlement. However, physical delivery is rare, and most speculators and hedgers are generally on the last trading day.