Therefore, the number of long and short positions must be equal.
For example, when I make multiple orders. Is it because someone in the market opened an empty order at the same time?
Yes! It may be sold, or it may be sold flat.
When I tied this hand. Has anyone taken over this list?
When you close your position, you close your position by selling. If the buyer accepts your order and calls it changing hands, the number of contracts in the futures market will remain unchanged. If the buyer takes your order, it is called double liquidation, and neither of you has an order, the number of contracts in the futures market will be reduced by one.
Determine the price change. What are the market transactions that push prices?
It is the demand and supply of the market and the financial strength of both long and short sides.