Putting any sum of money toward an investment is a big decision. You're likely to be happy with your choice if you buy two of Vanguard's most popular funds.

Exchange-traded funds (ETFs) are popular investment vehicles because they're easy to buy and sell, they give you exposure to different companies, and many of them charge low expense ratios. Some of them have even put up very impressive gains over time.

If you're looking for one or two ETFs to buy right now, you'd be hard pressed to find better ones than the Vanguard S&P 500 ETF ( VOO 0.75% ) and the Vanguard S&P 500 Growth Index ETF ( VOOG 0.71% ) . Both funds cost more than $100, but you can buy fractional shares through many brokerages, making it easier than ever to get started. Here's why putting $100 toward each

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