When doing short-term futures trading, refer to the stochastic swing index KDJ. It has three lines, and the J line is the fastest reflecting line. The reference method is one. When the J line crosses the K line, the golden cross means buying up, otherwise the dead cross means buying down. The second is the oversold zone below J20. Easy to rise. Overbought zone above 80. Easy to fall. Remember to follow the trend.