If you really have no idea what to invest in, you might want to consider either an investment advisor (make sure they are a fiduciary) or a rob-investing solution.Iu2019m a fan of Betterment (review) who will pick an appropriate mix for you based on information about you, including your risk tolerance level.That said, if you REALLY want to be a DIY investor and go through Fidelity, you probably need to do some research and some studying.Warren Buffett believes most investors would be best off in a low-cost S&P 500 Index fund.My friend Tim Maurer has a good Simple Money Portfolio that he explains nicely here: Simple Money PortfolioHope that helps!