How Stocks Work Full Size Version Share | Have A Question About This Topic? Name Email Address Question Thank you! Oops! Related Contents The Cycle of Investing Understanding the cycle of investing may help you avoid easy pitfalls. The Anatomy of an Index The S&P 500 represents a large portion of the value of the U.S. equity market, it may be worth understanding. 5 Smart Investing Principles Principles that can help create a portfolio designed to pursue investment goals.