Exchange-traded funds (ETFs) can be ideal investments to buy and hold for not only years, but decades. That's because they can give you a position in many top companies through just a single investment, making it easy to diversify your portfolio. The challenge can be finding the right ETFs. There is no shortage of ETFs to choose from, and finding good ones can seem overwhelming. However, a couple of growth-focused funds that can be ideal for any long-term investor to consider are the Invesco QQQ Fund (NAS ...