Since they were introduced to the stock market in the 1990s, exchange-traded funds (ETFs) have been among the most useful tools for investors. They offer all the broad market exposure of mutual funds, but they come in a more investor-friendly package -- their fees are typically lower, and they can be bought and sold in a brokerage account just like stocks. Investing made simple(r).

There are countless ETFs on the stock market, covering virtually any sector, industry, interest, or theme you could be interested in. Whether it's technology, cannabis, or space exploration, if you want to find an ETF for it, you likely can. That said, not all ETFs are equally helpful, and some are worth avoiding.

One ETF in particular I wouldn't touch with a 10-foot pole right now is the Vanguard Information Technology ETF (NYSEMKT: VGT) -- even with its recent success.

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Source Fool.com