This tutorial covers the addition of custom operations and URLs to resources, pagination, and search queries in a CRUD RESTful API built with API Platform and Symfony 4. It explains how to use annotations to customize the behavior of endpoints, including disabling default collection and item operations, adding custom URLs, creating custom controllers, enabling or disabling pagination, and implementing search queries using filters. The tutorial demonstrates how to modify these features globally or for specific resources, and provides examples of how to implement these changes in a Symfony 4 application.