Two-way trading of futures means that you can buy a position on a target or sell a position;
Take copper as an example. At present, the price of 1006 copper is 58,000 yuan/ton. At this time, do you think the market will rise in the future? You buy a hand at 58,000 yuan, and the copper price rises to 58,500 yuan in the afternoon. You can sell it and earn the difference (58,500-58,000 yuan) * 5 = 2,500 yuan;
Or if you think the market will fall in the future, you can also sell the copper futures contract at the price of 58,000. If the market falls, assuming it falls to 57,000, you can also buy back the same contract to close the position, and the closing income is (58,000-57,000) * 5.
As speculation, you can have no goods in hand, as long as you do the opposite before the contract expires.