There are a handful of must-follow fundamentals in stock investing, and the need for diversification sits high on the list. diversification can help hedge against company or sector-specific risks and promote long-term portfolio stability.

Luckily, achieving diversification doesn't have to involve buying dozens (or even hundreds) of individual stocks. It can be done with a few exchange-traded funds (ETFs) that cover a lot of ground.

Below are three ETFs that investors should consider adding to their portfolios in May. Each has a different focus that complements the others well.

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Source Fool.com