Cool knowledge: The trading technology of ordinary users is still at the stage of looking at various K-lines and indicators, which is equivalent to the backward technology of the stock era in 1995. Institutions have evolved to order book technology, which is a new technology developed in 2014. It beats the K-line school of 20 years ago, which is equivalent to driving a bomber to fight cavalry. Therefore, in contract trading, ordinary retail investors usually survive for about three months.