What he means is that as long as you care about the changes in the daily net value of the fund you buy. If you bought it yesterday, it is announced today that the net value of the fund has increased by 2%, which means that you have earned 2%. Of course, this does not include the handling fee. If the handling fee is 1.5%, the income on the first day will be reduced by 1.5%, and the cumulative net growth rate in the future will be your income.