Free resources
Guides
Planning guidance for migration work, free to read with no signup. Each guide stands on its own.
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Drupal 7 migration kickoff checklist
The ten decisions that stall a Drupal 7 to Drupal 10/11 migration — inventory, routes, field mapping, module verdicts, redirects, media, users, rehearsals, acceptance criteria, and rollback — each with a test for telling when it is actually settled.