Spot crude oil can buy up and down, as long as you have a good direction. Spot trading is to participate in the market from the beginning. For example, if you estimate that cotton will increase in price, now you buy a lot of cotton, stock it, sell it after the price increases, and earn the difference. With the development of the spot market, the trading mode of electronic disk has been introduced, which can be operated through the mobile phone network. The reason is still the same. After online trading, you only need to judge whether cotton prices are rising or falling, because if you judge the right direction, you will naturally make money. Online trading is only to simplify the process and judge the direction.