You should distinguish whether you buy short positions or multi-positions, that is, whether you buy short positions or multi-positions, as long as you choose "buy" or "sell" when you open positions.

Buying and opening positions

That's an empty warehouse (empty bill),

Selling and opening positions

That is to buy more positions (more orders)

If you are still not sure, you can ask the futures company for a simulation account, do the simulation, and be familiar with the software and operation process before making a firm offer.

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(note: the corners are dark),

If you have any questions, stand by.

At the beginning of a new contract, it can be sold without buying. It's called buying short positions,

In other words, when you expect a contract to fall in the future, sell the contract you don't own when the current price is high, and then buy it when the futures price falls to a certain extent, so the difference is your profit.