You can play it simple and build a portfolio using just one to three funds. If you choose correctly, you’ll get a low-cost, diversified mix of stocks and bonds that’s easier to track and manage.

With more than 2,500 different funds to choose from today, the ETF marketplace makes it simple to build a portfolio as simple or as complex as you'd prefer. Today, we're going to focus on simplicity.

Here's a simple ETF portfolio using just 4 ETFs offering ultra-low fees; they offer strong diversification and flexibility that would be appropriate for many retirees, notes David Dierking, editor ...