The document describes how to create the main content area of a webpage. It involves creating a rectangle layer named "c01" sized 300px by 175px and placing it 30px below the header. Text is added with title, description, and link styled with different fonts, sizes, and colors. A square border layer is made and styled with a stroke. The content is grouped and duplicated to create sections for "about", "services", and "portfolio" which are spaced evenly.