Arbitrage: Although there are several different ways of arbitrage, simply speaking, arbitrage is to buy one and sell one, and earn the difference between them: for example, you buy a recent sugar at 7000, and then sell a forward sugar at 7 100. When it really falls, the recent sugar you bought reaches 6900, and the forward sugar reaches 6950, and you make arbitrage money.

Speculation: you look in the right direction, then operate, and finally you earn and lose.

Of course, the risk of speculation is high, so you should look in the right direction. If you are wrong, you must stop. If you don't stop loss, you will earn it in more than a month, and there will be dozens of stops. If the unilateral market is good, if the market fluctuates, you will stop up and down, get slapped several times, and you will have nothing. So you must first hone yourself, look at the fundamentals in the long run and the technology (K-line) in the short term. I suggest you use the mold first.