It's not for nothing that so many legendary stock pickers, including the legendary Warren Buffett, have recommended index funds as the best choice for novice investors. They are, in truth, ready-made portfolios. Thanks to their exposure to the performance of many stocks, they offer much-needed diversification to any investment portfolio.

What's more, it's never been easier for people to invest in an index-tracking exchange-traded fund (ETF). There are many to choose from, but for me, one stands out: the Invesco QQQ Trust (NASDAQ: QQQ).

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Source Fool.com