Drupal 8 Themeing

gistfile1.txt

theme engines
https://sqndr.github.io/d8-theming-guide/new-theming-layer/theme-engines.html

twig coding standard
https://www.drupal.org/node/1823416

Twig standards
https://twig.symfony.com/doc/2.x/coding_standards.html

learn twig
https://codepen.io/mimoduo/post/learn-twig-with-trees

twig cheat sheet
https://codepen.io/mimoduo/post/twig-cheat-sheet

D8 themeing fundamentals
https://www.lullabot.com/articles/drupal-8-theming-fundamentals-part-1

D8 CSS style guidelines
https://www.drupal.org/node/1887918

D8 defing theme with info.yml file
https://www.drupal.org/docs/8/theming-drupal-8/defining-a-theme-with-an-infoyml-file

D8 Themeing
https://www.drupal.org/docs/8/theming