Different types of contracts indicate the expiration time. For example, corn c 1009 refers to the contract of 10 that expires in September, and so on. The full name of futures is futures contract, which is a standardized contract. The quality of varieties shall be stipulated by the exchange. You can see it on the website of Dalian Commodity Exchange. The same is true of soybean meal. The last trading day of corn is the tenth trading day of the contract month, and rest days are not counted. The last delivery date is the second trading day after the last trading day, and rest days are not counted. The last trading day of soybean meal coincides with corn, and the last delivery day is the fourth trading day after the last trading day. The price fluctuation of corn is greater than that of soybean meal, but the price is relatively low. New investors can start with these agricultural products.