The "Cost of Capital Workbook" provides a comprehensive guide on understanding and calculating the cost of capital for businesses. It covers topics such as defining cost of capital, estimating the cost of equity capital, and other related areas like valuation methods and common errors to avoid. The workbook offers practical tools and formulas to help determine the cost of capital, which is crucial for making financial decisions and evaluating investment opportunities. It also discusses the importance of considering factors like risk and market conditions when determining the cost of capital.