Futures and spot are completely different. Spot is actually a tradable commodity. Futures are mainly not commodities, but standardized tradable contracts with some bulk products such as cotton, soybeans and oil and financial assets such as stocks and bonds as the targets. Therefore, the subject matter can be commodities (such as gold, crude oil and agricultural products) or financial instruments.
The delivery date of futures can be one week later, one month later, three months later or even one year later.
A contract or agreement to buy or sell futures is called a futures contract.
Going long or short is one of the main contents of futures contracts.