ETFs and individual stocks can both form part of a successful long-term portfolio, but they create very different investment processes. Compare diversification, control, concentration, research and performance — and discover which investment decisions you should make yourself and which may be better delegated.

How many stocks should you own? There is no universally correct number. Learn how diversification changes as you add stocks, when additional holdings provide diminishing benefits, and how to avoid building an unnecessarily complex or over-diversified portfolio.