The reason why funds look at high returns is because investors see the historical returns of funds. Fund income = (net fund value on the current day-net fund value at the time of subscription) * fund share. Fund income does not need to be calculated manually by investors, but can be viewed directly in the position.

The fund mainly invests in a basket of stocks, and the income of the fund is determined by this basket of stocks. Invested stocks go up, funds go up, invested stocks go down and funds go down.