Copper, rubber, sugar, plastics, PTA, stock index, zinc and soybean oil are all available. The main efforts of general futures experts to grasp the big market are to be familiar with the fundamentals of varieties and dare to hold positions under the condition of strict logic of fundamental analysis. For the futures products copied by futures experts, the first thing is to look at the changes in positions and trading volume. In the case of paying attention to the variety inventory, it is a better choice to choose the delivery month near. Thirdly, it may depend on the basis and profit of the variety. Low inventory and low profit often lead futures to move closer to the spot to repair the basis.