Investors should learn some basic knowledge about funds before investing to make their investment more rational. First of all, they should correctly understand the risks of funds and buy the types of funds suitable for their risk tolerance. Second, the choice of funds can not be greedy and cheap. Many investors will choose funds with lower prices when buying funds, which is a wrong choice. Third, the new fund is not necessarily the best. In the mature foreign fund market, newly issued funds must have their own characteristics, otherwise it will be difficult to attract investors' attention. Fourth, the fund with more dividends is not necessarily the best fund. In order to cater to investors' psychology of making money quickly, some funds pay dividends immediately after the closed period. This practice is to take the money out of the investor's left pocket and put it in his right pocket, which has no practical significance. It is very beneficial to go to today's talents to listen to relevant courses.