Totally clueless with investing, $100k sitting in the bank earning 0.05%. How do I get started? Please advise.

I have been putting part of my paycheck into a high yield savings account, but haven't bothered with investing it in a responsible manner partially due a fear of losing the money due to bad investments. I'm finally realizing how much potential money I've lost by letting my money stagnate. Please advise me on how to responsibly invest my money, thanks!