Welcome to Fluther.
There are no high-interest and safe investments in cash in the USA. Not. Any.
Furthermore, no dollar-denominated investment, no matter how safe it appears to be, can be fully shielded from the risk contained in the stock market (which includes as a subset all US-based mutual funds). That’s because everything in the financial markets is interdependent; shocks felt in one segment will translate into other segments (sometimes in the opposite direction; that’s true). For example, a steep and prolonged drop in the overall values of stocks (which doesn’t happen on a whim or a rumor, that is) will cause cash itself to become more valuable, and that includes bonds and blue-chip stocks that pay dividends. So the bonds will appreciate in value, which will make their returns (based on your cost of investment) worth less… but still, safer at that point than stocks.
As @elbanditoroso has noted, the best interest-bearing accounts in the US money market still pay less than 1.5% interest per annum. That doesn’t even match inflation, which is also at historically low levels (but won’t stay there).
The best investment you can make at this point, or at nearly any point, is in your own education and understanding of these topics. Because another lesson you will need to learn to be a successful investor is to not rely too much upon advice from anonymous folks on the internet.