This document discusses best practices for developing modules for Drupal, including planning before coding, utilizing Drupal's built-in features, using tokens, rules, views bulk operations, elements, and plugins. It provides examples of how modules like HybridAuth and uLogin implement these concepts and recommends designing modules with flexibility, extensibility, and light architecture in mind. The document concludes by introducing a sample module that tracks and displays popular site content over time without loading the servers.