To gain significant traction an Open Source project needs active developers. The Symfony Community is well aware of this and is investing heavily in Developer Experience improvements via the Documentation, the Best Practises Book and the Demo Application.
Here is one developers suggestion on how to learn Symfony:
- Get to know the ropes with Silex
- Get insight with the Demo Application
- Reflect with the Best Practises Book
- Be productive and create quality code from the get go