Adjust the risk according to your own situation. If you are a novice at trading, I hope you can master the ratio of account funds to opening margin.
General risk rules tell us that the risk of each transaction cannot exceed 5%- 15%. For example, you open a position with 5% of all margin. If you lose money, you can use the remaining 95% 5% to open a position.
Risk-return ratio: The ratio of profit target to tolerable loss is generally set at 2: 1, but 3: 1 is better.
Don't forget the stop loss. Usually, when the market runs counter to your expectations, investors will unconsciously want to adjust the stop loss. But once the stop loss is set, please don't change it, otherwise the stop loss will lose its function of protecting assets.