The document discusses the codes and conventions used on contents pages of magazines. It describes several common elements including the title/masthead, main image, picture of the front cover, sub images with cover lines and page numbers, color schemes used to distinguish text, use of columns to organize information, large subheadings to identify sections, and inclusion of page numbers to indicate where articles can be found. The purpose of these standardized design elements is to clearly guide readers to find specific articles and content within the publication.