William J. O'Neil's How to Make Money in Stocks presents the C-A-N S-L-I-M investing strategy, a system emphasizing strong earnings growth, market leadership, and disciplined risk management. The book details how to identify promising stocks using fundamental and technical analysis, including chart patterns and institutional sponsorship. It stresses the importance of cutting losses quickly and avoiding common investor mistakes like chasing trends. O'Neil also suggests growth mutual funds as an alternative for less hands-on investors. Ultimately, the book provides a structured approach to stock selection and trading to enhance returns while minimizing risk.