This kind of investment is a two-way transaction, that is, long and short can make money, you can buy low and sell high to make a profit, and you can also sell high and buy low to make a profit.
Open the warehouse, open the warehouse. There are usually two operating modes in trading, one is bullish (buyer) and the other is bearish (seller). Whether you are long or short, placing an order is called "opening a position". It can also be understood that in trading, whether buying or selling, all new positions are called opening positions.
Closing position refers to the behavior of futures traders to buy or sell futures contracts with the same variety, quantity and delivery month, but in the opposite direction, and to close their positions. Simply put, it means "sell what you bought and buy what you sold (short)."