The document discusses planning web content by identifying reusable content pieces rather than focusing on pages. It provides examples of how different organizations and projects can break up their content into smaller reusable objects like articles, recipes, data visualizations, episodes, and questions. This approach allows the content to be more easily assembled and reorganized to meet changing needs and support different devices. The document encourages considering these reusable content pieces before designing pages and explains that this type of planning is important for both large and small teams or businesses.