The right investments can supercharge your portfolio, helping you maximize your earnings while minimizing risk. It can be tricky, though, to invest in the right places, especially when everyone's preferences and needs will be slightly different.

While there's no single correct way to invest, there is one exchange-traded fund (ETF) that could be a good fit for many people. It's not only one of the safest ETFs out there and almost guaranteed to make you money over time, but it's also earned the Warren Buffett stamp of approval.

Most of Warren Buffett's portfolio through his holding company Berkshire Hathaway is comprised of individual stocks. He does own two ETFs, though, both of which are S 500 ETFs: the Vanguard S 500 ETF (NYSEMKT: VOO) and the SPDR S 500 ETF Trust (NYSEMKT: SPY).

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Source Fool.com