Read any of William Bernstein's books. The Investor's Manifesto is a good one. If you don't want to engage in the emotional rollercoaster of price, it's a good

Read any of William Bernstein's books. The Investor's Manifesto is a good one. If you don't want to engage in the emotional rollercoaster of price, it's a good idea to set your investments on autopilot--have your broker automatically buy a certain amount each month without having to think about it. Don't touch it! (Except for rebalancing)