If the funds are sufficient, it is ok to invest in three funds, but when investing in one fund, you should choose three good funds. When investing in a fund, you can consider the fund manager, the fund's past rate of return, the fund's establishment time, the morning star level and so on.
Investors can choose stock funds, hybrid funds and index funds when choosing fixed investment funds, because these funds are volatile, risky and have the same returns. Fixed investment can spread risks.