Drupal's strength lies in its extensibility through custom modules, and Drush, the command-line interface, significantly streamlines this process. As a practical guide, this article details the step-by-step process of crafting custom Drupal modules with Drush. Starting with 'drush generate module' to initiate module structures like .info.yml, .module, and .routing.yml, it then navigates through defining routes, adding functionality, and enabling modules via Drush commands. Drush ensures smooth functionality, emphasizing rigorous testing, empowering developers to fine-tune Drupal's features for project-specific needs, and enhancing their Drupal development endeavors.