"Risk comes from not knowing what you're doing," Warren Buffett

In Buffett's mind, one of the best investments you can make is in yourself and the knowledge you have. This is why Buffett spends hours of every day reading, and has done so for most of his life. The better educated you are on a topic, whether it's investing or anything else, the better equipped you'll be to make wise decisions and avoid unnecessary risks. As Buffett's partner Charlie Munger has advised: "Go to bed smarter than when you woke up."