Actually, after analyzing everything, it's better to just open a 10U position per order, place a trial order, and set proper take-profit and stop-loss levels; once you see the outcome, you'll know right or wrong. Open three long positions and three short positions; in a successful scenario, both sides get filled, but all long positions hit stop-loss while all short positions profit. The more mistakes you make and practice, the better your technical intuition becomes. For short-term trading, focus on market trend orders rather than limit orders; during the first 3-5 minutes after US stock market opens, you must close all positions regardless of profit or loss.