To do futures, you must learn to stop loss and set a good stop loss point, which can not only ensure your existing profit, but also make you lose as little as possible within the stop loss range under unfavorable factors. As for short positions overnight, it is very dangerous for futures varieties with large fluctuations. It's a night, but you'll never guess what will happen tonight. It may double your capital, but it may also make your capital disappear overnight. Futures, like individual small investments, are short-term or small-scale ups and downs of agricultural products.

The interest income of futures is similar to that of stocks, which are deposited by a third party. Untraded funds have interest. As for how much, you have to ask the futures company you choose.