How To Display Node Tokens/Keys/Content Fields In Twig Template
With Drupal 8 you now have two ways to access to the data of a given node/entity.

The first is with the {{ content.* }} this will return the content that went through the display plugins/system (everything which you configure in the "Display mode" of the content type).

You also can access to the raw data with {{ node.*.value }}

It's preferably that you use the way {{ content.* }} as much as possible in order to be able to use the power of Drupal to quickly change the things with display mode.