i dont want lose my money
US Treasury bonds or savings bonds. They are safer than bank accounts (ostensibly), so the risk is as small as you can get while still investing. You can even open a Treasury Direct account and link it to your bank account and buy treasury bonds electronically. An online savings account probably yields better for short term investments, and it's easier to set up, and there's generally higher liquidity. The added risk is so slight that it's clearly a superior option in my mind. If you're looking for low risk, that's the best you can do. Trying to chase yield higher than what those two options offer opens you up to more risk.