Drupal's official documentation for the Migrations and Migrate API
The guide to the UI is still just a stub: https://www.drupal.org/docs/8/migrating-to-drupal
The Migrate API documentation is pretty comprehensive, and includes ways to use it: https://www.drupal.org/docs/8/api/migrate-api/
Building a custom migration in Drupal 8 blog series by Tess Flynn (socketwench)
https://deninet.com/blog/1615/building-custom-migration-drupal-8-part-1-getting-started
Migrate All the Things presentation by Dave Vasilevsky
https://events.drupal.org/baltimore2017/sessions/migrate-all-things
Migrating Multilingual Content in Drupal 8 presentation by Jigar Mehta
https://www.youtube.com/watch?v=L3SQiIAlvhA
with slides.
Migrating SQL to Drupal 8 with Migrate Tools and Migrate Plus
https://colorfield.be/blog/migrating-sql-in-drupal-8-with-migrate-tools-and-migrate-plus
Avoid sending emails while doing a migration on Drupal 8 by David Valdez
http://agaric.com/blogs/avoid-sending-emails-while-doing-migration-drupal-8
Slides from Mauricio Dinarte and Benjamin Melançon's presentation at DrupalCamp Twin Cities 2017:
https://docs.google.com/presentation/d/1rgEirVassqCRjgDqJ7p32nYcRRVACdi3x9Te7rOVSLk/
Extra tips, not in the slide deck:
* Use --limit while working on a large migration.
* Use git! Commit all changes to the migrate_plus.migration*.yml files you're working on. Then you can export configuration (such as for changes made to your field definitions) without fear, and git checkout your migrate_plus.migration*.yml file or files, and then import it all.
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