Buying a stock is only half of the equation. Knowing when to sell is just as important. The first part of this course discusses why it's critical to cut your losses early. The second and third lessons teach you how to spot the best time to sell and take your profits, including ways to use stock charts to detect a weakening stock.
These lessons are based on decades of research that continues to this day into the primary factors that move stocks. These principles aren't based on someone's opinion or theories from business schools. They're all based on what actually works in the market.
Source
http://www.investors.com/learn/s.asp
