Field API
Custom fields can define a database schema and customize the form and display. Fields are implemented as plugins. FieldType...
#Field API
Articles
Commerce Entity Select Widget
Drupal Commerce has a field widget, Commerce Entity Select that does some interesting things with the field and form API. Source...
Issues
Revaluate the concept of 'extra fields'
Debate on usage of entity extra fields.
Resources
Dynamic/Virtual field values using computed field property classes
Pseudo/extra field documentation.
Various ways of updating field values in Drupal 8 and 9
Shorthand for setting field values.