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What should I be aware of as a young investor?
You are your own worst enemy when it comes to investing. You might think that you can handle a lot of risk but when the market plummets you don't know exactly how you'll react. Many people panic and sell at the worst possible time, and that kills their returns. Will that be you? It's impossible to tell until it happens. Don't just invest in stocks. Put some of your money in bonds. For example TIPS, which are inflation adjusted treasury bonds (very safe, and the return is tied to the rate of inflation).  That way, when the stock market falls, you'll have a back-stop and you'll be less likely to sell at the wrong time. A 50/50 stock/bond mix is probably reasonable. Some recommend your age in bonds, which for you means 20% or so. Personally I think 50/50 is better even at your young age. Invest in broad market indexes, such as the S&P 500. Steer clear of individual stocks except for maybe 5-10% of your total. Individual stocks carry the risk of going out of business, such as Enron. Follow Warren Buffet's two rules of investing:  a) Don't lose money b) See rule a). Ignore the "investment porn" that is all around you in the form of TV shows and ads. Don't chase hot companies, sectors or countries.  Try to estimate what you'll need for retirement (if that's what your investing for) and don't take more risk than you need to. Try to maintain a very simple portfolio that you'll be able to sleep well with. For example, check into the coffeehouse investor  Pay a visit to the Bogleheads Forum - you can ask for advice there and the advice will be excellent. Avoid investments with high fees. Get advice from a good fee-only investment advisor if needed. Don't forget to enjoy some of your money now as well. You might not make it to retirement. Read, read, read about investing and retirement. There are many excellent books out there, many of which you can pick up used (cheap) through amazon.com.