What you can do with Drupal core's Twig is pretty great, but the Drupal community always brings so much more to the table after real world use. Here is a big list of Twig helper modules to help build out your next Drupal theme!
20 Drupal Modules to Boost Your Website’s Functionality - Neweb
Are you a Drupal 7 user who wants to migrate to Drupal You're not alone. "Can I rebuild my site in Drupal is a very common question in the Drupal community. This tutorial will show you how to use the Upgrade Status module to see if you can.
One of the biggest changes in Drupal 8 is the integration of Rest services in the core. With use of Views it become very easy to create RESTful Services. But there are certain situations when you need to create your own custom REST Resources.