Here are some key points you should learn to develop a Symfony application:
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Understanding the Symfony Architecture: Symfony follows the MVC (Model-View-Controller) pattern. Understanding how controllers, entities (models), and views (Twig templates) interact is crucial.
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Routing: Learn how to define routes using annotations or YAML, and how to generate URLs.
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Controllers: Controllers handle the business logic of your application. Learn how to create controllers and return responses.
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Twig Templating Engine: Twig is the default templating engine in Symfony. Learn how to create views with Twig.
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Doctrine ORM: Doctrine is the default ORM (Object-Relational Mapping) in Symfony. Learn how to define entities, run queries, and perform database operations.
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Forms: Learn how to create forms, handle form submissions, and validate form data.
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Validation: Learn how to use Symfony's validation constraints to validate data.
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Services and Dependency Injection: Services are central to Symfony applications. Learn how to define services and inject them into your classes.
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Security: Learn how to handle authentication and authorization in Symfony.
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Testing: Learn how to write unit tests and functional tests for your Symfony application.
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Console Commands: Learn how to create console commands for tasks that should be run from the command line.
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Events and Event Listeners: Learn how to use Symfony's event system to hook into various parts of your application.
Remember, Symfony is a vast framework and it's okay not to know everything at once. Start with the basics and gradually delve into more complex topics as you gain more experience.