materio-d9/modules/custom/materio_migrate

debugging-migrations

https://www.drupaleasy.com/blogs/ultimike/2016/04/drupal-6-drupal-81x-custom-content-migration

https://thinkshout.com/blog/2017/05/skipping-a-version-migrating-from-drupal-6-to-drupal-8-with-drupal-migrate/

https://www.drupal.org/docs/8/upgrade/known-issues-when-upgrading-from-drupal-6-or-7-to-drupal-8

https://drupal.stackexchange.com/questions/164612/how-do-i-remove-a-configuration-object-from-the-active-configuration

https://www.metaltoad.com/blog/drupal-8-migrations-part-3-migrating-taxonomies-drupal-7

https://www.sitepoint.com/your-first-drupal-8-migration/

https://evolvingweb.ca/blog/drupal-8-migration-migrating-taxonomy-term-references-part-2

text to taxonomy term

Upgrading Drupal 6 and i18n Content Translation to Drupal 8

Migrating Drupal 7 File Entities to Drupal 8 Media Entities

D6 Taxonomy Term Reference Field is not migrated to D8 Field

Migrer un site Drupal 6 ou Drupal 7 vers Drupal 8

Migrating Aliases and Redirects to Drupal 8

Migrating Drupal 7 redirects to Drupal 8

How to refresh new migrations in Drupal 8 migration module?

Drupal 8 Migrations: Taxonomy and Nodes

Migrating Content Translated with "Content Translation" from Drupal 7 to Drupal 8

Drupal 8 Migration Survival Strategies