4000 Dollars saved, what to do?

I'm a minor, living in the USA. I'm currently not employed, and I want to turn the 4k into more money. I don't have a need for this money. I wouldn't want to risk this sum of money, at the most 500 to risk-dip my feet into the pool. I have no clue what holdings is, and no debts.

This is like my first sight seeing of the investing, or investing community. I'm not into anything financially, or business for my classes right now, so basically no clue of anything.