A large number of empty orders are not flat, indicating that empty orders are still held. It can also be seen that these institutions are still bearish (but we can't completely believe that they will be bearish when they do this)

Futures, whether stock index futures or commodity futures, are traded in the form of contracts.

You should be aware that if you want to close the empty orders held by this large institution, you must buy the number of contracts sold at the time of your last order.

Short selling means selling, long selling means buying, and liquidation means reverse operation.

Making money is also making the difference: for example, selling (shorting) is 3000 points, and closing (buying) is 2500 points, which means you earned 500 points after closing.