A fund can earn very little money by buying tens of dollars. It is basically impossible to get rich by buying tens of dollars, but it is possible to make money by buying funds, that is, the income earned may be very low, only a few cents, but it will increase over time.
Generally, tens of dollars are used to buy money funds. Basically, the income of one point per day will not increase much, and even if it accumulates over time, it will basically not make any money.
Generally, there are dozens of dollars in hand to make more money. It is recommended to buy stock funds or hybrid funds. These funds have high risks and high returns. You may earn about a dollar a day, and you will lose so much. Depending on what fund you buy, the increase of the fund is different, but it usually falls. It is still very difficult for those dozens of funds to make money.
If you want to buy a fund to make money, you must first choose a good fund and see how the income has been in recent years. A good fund can't always be negative. Secondly, it depends on the fund manager, Morningstar rating, past performance of the fund and so on. Then, the amount invested should not be too small. For example, if you invest tens of dollars, the daily income is really minimal, and it is difficult to make money.