Locking a bill means opening multiple bills and an empty bill. Generally, if you don't want to stop loss after looking at the wrong direction, you will open an opposite list to lock in the risk, and then gradually earn back the loss in future operations. However, in practice, due to the weakness of human nature, locking orders often becomes chronic suicide.

Hedging is a way to reduce business risks while still making profits from investment. General hedging is to conduct two transactions at the same time, both related to the market, in the opposite direction, with the same amount and breakeven. Market correlation refers to the identity of market supply and demand that affects the prices of two commodities. If the relationship between supply and demand changes, it will affect the prices of two commodities at the same time, and the prices will change in the same direction. The opposite direction means that the buying and selling directions of two transactions are opposite, so that no matter which direction the price changes, there is always a profit and a loss. Of course, in order to protect the capital, the number of two transactions must be determined according to the range of their respective price changes, so that the number is roughly the same.