Order, in English, refers to the variety you need to buy and sell, the contract month, the direction, the price, the number of lots, whether to open or close the position. This is your purchase order.

The market price refers to the immediate transaction at the market price, which is quick, but it may be bought at a high price or sold at a low price.

Limit means that you have a specific price, buy at or below this price, and sell at or above this price.

Stop loss is also called order cancellation. You can withdraw the issued order before the transaction is completed. Under normal circumstances, the market order should not be withdrawn. Unless you are waiting in line for the price limit, the order will be closed immediately and cannot be withdrawn.