Check Status report under Reports in the Administrative GUI. Fix all errors and warnings before proceeding. Before updating, make a back up with Backup and Migrate or Drush, so you can roll back if anything goes wrong. If you use Drush, update to minimum Drush 12.4.3 to be Drupal 10.2 compatible:
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| composer update drush/drush
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Update Drupal core with this command:
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| composer update "drupal/core-*" --with-all-dependencies
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Use Drush to run required database updates and rebuild caches:
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| drush updatedb
drush cache:rebuild
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Check Status report under Reports. Fix all errors and warnings.
If using ddev
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| ddev ssh
composer update "drupal/core-*" --with-all-dependencies
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