You can buy a fund with a high net value. The higher the net value of the same index fund, the better the fund performance. However, the fund's net value cannot determine the rise or fall of the fund. Therefore, investors still choose funds based on the fund manager, historical performance, and tracking error.

Fund investment targets are selected by the fund manager. If the fund manager's investment level is higher, the fund's tracking error will be smaller, and the fund may obtain excess returns. On the contrary, if the fund manager's investment level is lower, the fund's tracking error will be smaller.

The larger the index, the more likely the fund will not be able to outperform the index. The fund's historical performance represents the fund's past returns. The higher the historical performance, the better the fund is.