There are many signs that can tell you that you are good with money. The first sign is if you have been able to save a substantial amount of money.
Another sign is if you have successfully lived on a budget before, and were able to not only keep up with your expenses, but also managed to save some money.
You may also be good at managing your credit card debt. This can be seen by the fact that you are able to pay off your balance in full each month, or at least pay it down significantly.
The final sign is if you have successfully predicted the future and made investments accordingly.
The signs that you are good with money are when you have a healthy financial lifestyle and know how to manage your finances. You could be good with money if you have an emergency fund, invest in the stock market, or have a budget.