If you want to be conservative, you might put your money in short term treasuries. They don’t pay much, but you don’t need to worry about losing any of your capital. (Although like all dollar investments, you could lose purchasing power as the dollar declines in value) One nice thing is you can do this through Treasury Direct, and not pay any broker fees whatsoever.
Advantages: Investment is fully backed by the USA government. Never loses any capital, no broker fees to deal with.
Disadvantages: Doesn’t pay that great a return. But hey, you don’t risk much, you can’t really expect a lot of upside.