Choose a low-cost fund. How to invest in funds, first choose low-cost funds. Different from the general thinking that domestic fund investors value expected returns, John? Berg puts investment cost first. For controlling the investment cost of funds, he suggested considering from two aspects: index funds are better than active funds; Among active funds, low turnover rate is better than high turnover rate. Don't overestimate the star fund. John? "The fund industry knows very well that almost all the top performers will lose their edge one day," Berg said. Fund managers insist on spending huge sums of money to spread the past performance widely, with only one purpose, that is, attracting a lot of new funds from investors. " For the real reference significance of historical performance, he believes that these data can help investors analyze whether the performance of the fund is sustainable, such as whether the fund can always maintain good performance after experiencing the complete test of bulls and bears. Big is not necessarily good. He once mentioned an example: a growing medium-sized market fund in the American market attracted a large number of subscriptions because of its excellent performance, but its performance deteriorated with the expansion of the fund share. Investors should pay attention to the fact that funds with low turnover rate and stable inflow of subscription funds are easier to manage than funds with active operations and large changes in fund shares, because the latter needs more frequent transactions. Don't hold too much money. John? Berg thinks there is no need to hold four or five stock funds, because the effect of excessive diversification is similar to that of an index fund, but because of the high cost of stock funds, the final income is likely to be lower than the index.