Drupal 8 is upon us and with it comes the Twigification of all theme output. Anything that was a PHP template or theme function in Drupal 7 is now a Twig template so we all need to level up on our Twiggy knowledge—and I'm not talking about this Twiggy or this Twiggy.

Introduction

TODO

Syntax

TODO A few examples to grok it

Documentation

From the creators: 

• http://twig.sensiolabs.org/
• http://twig.sensiolabs.org/documentation
• http://twig.sensiolabs.org/doc/templates.html Good outline of syntax and semantics

Tutorials:

• Not Drupal specific despite being on Drupalize.me but fairly comprehensive outline of all the concepts. 
  https://drupalize.me/videos/twig-basics?p=1899
• Overview page with links to all the Drupal-specific Twig videos.
  https://drupalize.me/tutorial/twig-drupal?p=2512

• Lots more in-depth and Drupal specific stuff here.
  https://drupalize.me/search?query=twig