This free online course will teach you the basics of stocks and short selling. Companies often issue stocks to raise money and grow. When you purchase a company’s stock, you are purchasing a small piece of that company. Normally, you buy stocks in the hopes that they will increase in worth – but how can you profit if the stocks you bought a decline in price? The answer is shorting. This course will teach you all about how shorting works – Khan Academy, Alison.com