This document outlines various valuation methods and metrics used to evaluate companies, including: 1. Free cash flow models like FCFF and FCFE which discount future cash flows. 2. Common valuation ratios like P/E, P/B, EV/EBITDA which compare price to earnings, book value, or cash flows to determine if a company is cheap or expensive. 3. Growth-adjusted ratios like PEG which incorporate growth rates to compare companies with different growth profiles. The document provides examples of calculating various valuation metrics and outlines how investors can use them to determine what price they should pay to achieve their required return.