The document discusses the importance of product knowledge for effective selling. It defines product knowledge as understanding the features, functions, and benefits of a product. A salesperson needs to fully understand the product in order to answer customer questions, address objections, and provide strategic advice to management. The document recommends several ways for salespeople to gain product knowledge, including through company training, understanding specifications and competitors, and knowing how to use and support the product. It emphasizes that product knowledge is key to successful selling, especially in competitive markets.