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 | Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Contents Should You Invest in Exchange Traded Funds? There are hundreds of ETFs available. Should you invest in them? How Stocks Work Understanding how a stock works is key to understanding your investments. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.