Investing in the stock market seems extremely complicated, but it can be incredibly simple. The key is to identify the highest-quality companies -- those that sell great products and services, have competitive advantages and solid growth prospects, and are trading for reasonable valuations. These criteria aren't difficult to fill. Moreover, it's important that investors maintain a long-term mindset, as a lot of time is needed to build truly life-changing wealth. 

It's simple, but it's not easy. That's because often, the biggest barrier to achieving strong returns is the investor's own behavior and emotions. Here's one money-wasting mistake it's actually easy to avoid. You'll become a better investor by simply being aware of this. 

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Source Fool.com