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Series Overview & ToC | Previous Article | Next Article – coming soon! — So far we have migrated three entity types: content types, taxonomy vocabularies, and paragraphs. It is very common that fields are attached to those, and other entities, to collect and display data. Field migrations can be tricky. For one, it is a multi-step process that requires, at a minimum, four different migrations. Additionally, it is common to find errors because field related configuration used in Drupal 7 is not available in Drupal 10. In this article, we take a pause from executing migrations to understand how fields work in Drupal. The information presented today will prove useful for custom migrations, especially when they include content model changes. ## Understanding Drupal fields Drupal fields are used to provide structure to the information the CMS stores. They save discrete data, which can be used for displaying, filtering, and sorting purposes. Fields are attached to entities like nodes, users, taxonomy terms, blocks, etc. For entities that can have bundles, each bundle can have a different set of fields attached to them. The node entity, for example, almost always has a different set of fields attached to each content type…