Open position: 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.
Flat multi-position, that is, after buying, complete the transaction under the condition of profit and loss. Closing a position means completing the transaction.
Closing a position refers to selling the originally bought contract or buying the originally sold contract. After closing the position, lighten the position, closing the short position is equivalent to buying, and closing the long position is equivalent to selling.