Upgrading from Drupal 7 to Drupal 10

Create a new D10 portal. Enable migrate modules. Enable https://www.drupal.org/project/migrate_upgrade to allow migrations via Drush. Set up a Migrate Database $databases['migrate']['default'] = [
'database' => 'drupal7db',
'username' => 'drupal7db',
'password' => 'drupal7db',
'prefix' => '',
'host' => 'localhost',
'port' => '',
'driver' => 'mysql',
'namespace' => 'Drupal\\mysql\\Driver\\Database\\mysql',
'autoload' => 'core/modules/mysql/src/Driver/Database/mysql/',
];
Migrate configurations only via Drush drush migrate:upgrade --legacy-db-key=migrate --legacy-root=https://example.com --configure-only
Creating a new custom field. Ex: og_group_ref. Drush provides intuitive interface to create a field with custom machine name drush field:create
-- Links https://www.drupal.org/docs/upgrading-drupal/upgrading-from-drupal-6-or-drupal-7/drupal-9-or-later-migrate-modules https://www.drupal.org/docs/upgrading-drupal/upgrading-from-drupal-6-or-drupal-7/choosing-the-upgrade-approach https://www.drupal.org/docs/upgrading-drupal/upgrading-from-drupal-6-or-drupal-7/upgrade-using-drush https://www.drupal.org/docs/contributed-modules/create-fields-programmatically/basic-usage