First of all, stock index futures are an investment tool, and 1906 refers to a certain contract of stock index futures. The stock index here refers to the stock index, and the stock index is an important indicator that reflects the overall operating trend of the stock market.

Secondly, stock index futures trading is conducted in contract units, and each contract includes a certain number of stock indexes. The 1906 contract means the June 2019 contract. This means that if you want to participate in stock index futures trading, you need to trade within a specific time period, rather than being able to trade at any time.

Finally, the trading risk of stock index futures is relatively high, which requires investors to have high financial strength and risk tolerance. When trading stock index futures, you need to pay attention to various factors such as macroeconomic data, policies and regulations of the entire market, and conduct comprehensive analysis and judgment. At the same time, you also need to have strong operational capabilities and risk awareness to avoid unnecessary losses and risks.