Getting Started with Magento 2 Module Development

<h2>Introduction</h2><p>Building custom modules for Magento 2 is one of the most powerful ways to extend your e-commerce store. In this guide, we will walk through the fundamentals of module development, from registration to dependency injection.</p><h2>Module Structure</h2><p>Every Magento 2 module follows a specific directory structure under <code>app/code/Vendor/Module</code>. The essential files include <code>registration.php</code>, <code>etc/module.xml</code>, and <code>composer.json</code>.</p><h2>Dependency Injection</h2><p>Magento 2 uses constructor injection as its primary DI pattern. You declare dependencies in your constructor, and the ObjectManager resolves them automatically via <code>di.xml</code> configuration.</p><h2>Best Practices</h2><p>Always use service contracts (interfaces) instead of concrete implementations. Follow PSR-12 coding standards and write integration tests for your repositories.</p>