At Drupal Partners, we specialize in helping businesses of all kinds make the transition to Drupal 10. Here is an eBook that discusses at length on Drupal 10 even before its arrival. It covers essentials such as:

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What’s New with Drupal 10
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Why is it releasing so soon
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How you can do to get ready for Drupal 10
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Updates from the Drupal 10 readiness initiative
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Preparing your site for Drupal 10, and more