Owning individual stocks can certainly be exciting. If you've been an investor for any time at all, however, you also know that picking companies and then keeping tabs on them can be a lot of complicated work. There may be other things you'd rather devote your time and energy to instead.

If so, there's an easy solution: buying and holding theme-based baskets of stocks. You know them better as exchange-traded funds (ETFs). These investments let you fine-tune your allocation strategy without forcing you to pick any individual equities. That's why they're also low-maintenance investments.

These four ETFs each follow different strategies, but all of them look like particularly attractive prospects this month.

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Source Fool.com