For contracts in the futures market, sell them first and hope to buy them back at a lower price in the future. The transaction that earns the difference is called "short" transaction.
Contract is the subject matter of futures trading. Because it is a margin trading system, even if there is no contract in hand, you can sell it first. This is called opening a short position. The repurchase operation of this kind of transaction in the future is called liquidation!
Conversely, those who buy the contract first are called bulls. .....