Paragraphs

https://www.drupal.org/project/paragraphs
https://www.drupal.org/node/2444881
https://www.ixis.co.uk/blog/using-paragraphs-drupal-8

paragraph__[view_mode] (e.g. paragraph--default.html.twig) paragraph__[type] (e.g. paragraph--image.html.twig) paragraph__[type]__[view_mode] (e.g. paragraph--image--default.html.twig)