Upgrade the Drupal 9 to Drupal 10, fortunately is much more easy than upgrade from Drupal 7 to Drupal 8 or 9, however it still needs high Drupal knowledgment from the developer that will do. It requires to check the Drupal 10 requirements, some (pre and pos) upgrade steps to make sure that everything was upgrade successfully. See below the topics that I believe that is crucial to any developer to upgrade your current Drupal 9 project to the latest Drupal 10 version.
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