Never use high leverage, focusing on small immediate gains. Once you continuously blow up your small capital, and can't recover your principal, you will be trapped in a misunderstanding.

Assuming you have 1 million, and you play 10,000 each time, going back and forth, you lose 100,000. But you don't dare to play too big, so you start to double it, playing 20,000, and you lose another 200,000. Then you increase it to 50,000 each time, going back and forth, and in the end, your 1 million is gone. But if you had started playing 100,000, 200,000, or 400,000 each time, winning just once would have allowed you to break even. However, you didn't realize this, so in the end, you are left with nothing.