Principles and Practical Methods Used by the World's Greatest Investor.
This book shows how Buffett took a $100 investment and turned it into one of the most successful multi-billion dollar companies in the world. It covers how Buffett began his career - learning from Benjamin Graham - and his adherence to certain key principles such as investing in old style traditional American companies, holding the companies forever, hiring and keeping the same managers, etc.
This book covers the kind of research that Buffett does before selecting investments and there's also a discussion of some of Buffett's admitted mistakes and investments that haven't yielded the profits he anticipated. While the stock market experiences ups and downs, many investors want to learn from Buffett's strategies since he has weathered many years as an active investor who has made some very shrewd investment choices.