Investors can set a stop loss point. When the fund profit reaches the stop profit point, it can stop profit, and when the fund loss reaches the stop loss point, it can stop loss.

Take the fund's profit as an example: suppose that the fund purchased by an investor is not sure that the subsequent fund will not rise, then you can choose to take half of the profit to ensure part of the income, and the fund will continue to rise and then take half of the profit until the fund is sold.