It Was the Best of Times, It Was the Worst of Times All about how missing the best market days (or the worst!) might affect your portfolio. Share | Related Content Should You Invest in Exchange Traded Funds? There are hundreds of ETFs available. Should you invest in them? Investing for Impact Learn how to build a socially conscious investment portfolio and invest in your beliefs. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.