One of Drupal’s greatest strengths is it’s huge catalog of modules and themes. At the time of this writing, Drupal boasts over 15,000 modules and almost 1,500 themes on Drupal.org. The challenge is knowing which modules, themes to use and how to maintain them with custom code and other customizations throughout the life-cycle of a website. While there are tutorials and blogs out there that can help, there isn’t exactly an instruction manual on which modules to use and which to avoid for production sites.