4.12
Today, I made two transactions, and the other was yesterday's limit order.
Overall, it's OK, and the funds have reached $539.
Summary:
1. The buying and selling points should be optimized, and try to achieve the ideal buying point. You can buy in two positions, or limit orders.
2. When watching the market, you can actually close the position directly after short-term profit, and open a position again after it rebounds.
Later, start to go long on Bitcoin.