Avoid Being Pressured into an Investment Avoid Overdiversification

Avoid Market Timing

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Don't try to time the market. Get in and stay in. We don't know what direction the next 10% move will be, but we do know what direction the next 100% move will be and that is up.
Source: http://www.investorguide.com/igu-article-418-investing-basics-principles-of-investing.html