The document discusses must-have WordPress plugins, including where to find plugins, how to choose plugins, and 10 recommended must-have plugins. It recommends plugins for security, spam protection, SEO, site backups, caching, contact forms, and social sharing. Additional "nice to have" plugins mentioned are for duplicating posts, exporting URLs, editorial calendars, and ecommerce functionality. The document is a guide on selecting useful WordPress plugins to extend site functionality.