There is a medium-sized website based on Drupal 9 that needs to be upgraded to Drupal 10. Here is a guide on how we upgrade this website.
Backup Files & DB & Config:
drush cex
drush sql:dump | gzip -c > ../backup_d9/db-$(date +%Y-%m-%d-%H%M).sql.gz && tar -zcf ../backup_d9/web-$(date +%Y-%m-%d-%H%M).tar.gz ../httpdocs/
Upgrade deprecated core modules (convert to contrib) :
composer require 'drupal/aggregator:^2.1'
composer require 'drupal/ckeditor:^1.0'
composer require 'drupal/color:^1.0'
composer require 'drupal/quickedit:^1.0'
composer require 'drupal/rdf:^2.0'
Uninstall unneeded modules
drush pmu devel
drush pmu upgrade_status
Upgrade Drupal 9 to Drupal 10
chmod 777 web/sites/default
chmod 666 web/sites/default/*settings.php
chmod 666 web/sites/default/*services.yml
composer require 'drupal/core-recommended:^10' 'drupal/core-composer-scaffold:^10' 'drupal/core-project-message:^10' --update-with-dependencies --no-update
composer require 'drush/drush:^12' --no-update
composer require 'twig/twig:^3.4' drupal/hal 'symfony/event-dispatcher:^6.2' psr/log 'drupal/slick_extras:^1.0@RC' 'chi-teck/drupal-code-generator:^3' --no-update -W
composer update -W
drush updb -y
Update
composer update && drush updb -y