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Drupal 8 HowTo
Search the Drupal 8 HowTo.
How to get a form by it's class name in Drupal 8.
How to get all field definitions per content type in Drupal 8.
Sometimes you need to get all fields that belong to a node content type and cycle through them. This is how you can get all content type field definitions in Drupal 8.
How to get the current node id in Drupal 8.