Opening a position without any trading idea of my own, just seeing K say to enter the market, so I opened a position, and then did not set a stop-loss, and kept holding on, resulting in losses.\nFuture operations: Always set a stop-loss! Only open a position after setting a stop-loss, do not open positions casually; when placing an order, simultaneously set a stop-loss and take profit. After accepting this lesson, I will still focus on intraday short positions, strong in small cycles, and acknowledge the facts.