http://www.symfony-project.org/book, http://www.symfony-project.org/jobeet, http://www.symfony-project.org/getting-started, http://www.symfony-project.org/reference, http://www.symfony-project.org/tutorial, http://www.symfony-project.org/forms, http://www.symfony-project.org/doctrine, http://www.symfony-project.org/cookbook, http://www.symfony-project.org/more-with-symfony, http://www.symfony-project.org/advent_calendar