Prepopulating taxonomy term or other entity reference values from helper links in Drupal
Sort of long after the fact notes from making the Create Content with Category | Drupal.org module.
- Entity reference field implementation clarification [#3047862] | Drupal.org
- https://git.drupalcode.org/project/prepopulate/blob/8.x-2.x/tests/src/Functional/PrepopulateFieldTest.php#L172
- Prepopulate for Entity Reference fields in Drupal 8/D8 [#2668010] | Drupal.org
- Support prepopulating entity reference field with entity-browser as widget [#3086126] | Drupal.org
- drupal 9 configFactory vs config
https://www.drupal.org/docs/drupal-apis/configuration-api/working-with-configuration-forms