Sources

Where to start

• Symfony: The Fast Track — a book by the framework's author: an application from scratch to prod.
• Symfony documentation — start with Routing, Controller, Service Container, Doctrine.
• Best Practices — a short official recommendation on how to structure an application.
• SymfonyCasts — video courses by topic, some of them free.

By topic

• Service Container — autowiring, decoration, tags, lazy services.
• Doctrine ORM — especially the Unit of Work, Associations and Batch Processing chapters.
• Zenstruck Foundry — test data factories instead of fixture files.

Versions

• Symfony releases — which versions are supported and until when.
• Preparing for Symfony 7.4 and 8.0 — the official word on the difference between 7.4 and 8.0, support and the upgrade path.
• Symfony 8.1: curated new features — the full list of what's new in 8.1 with links to each change.
• Release 8.1 — release date, minimum PHP version, end of support.
• JoliCode: upgrading to Symfony 8 — what broke on a real project when moving to 8.0.

The ?Vote argument in a voter requires Symfony 7.3+. If you work on an older version, check against the documentation for your specific version: there is a version switcher at the top of every page on symfony.com.