Error while migrating Drupal8 site to hosting. Where to dig?

Question

Drupal

Hosting has been preconfigured. Having transferred the empty version of the site, I made sure that everything is fine.
The problem is somewhere in the site.
The site is in maintenance mode. Transferred files and database, configured settings.php.
When starting the site, it gives a message: "The website encountered an unexpected error. Please try again later."
Where to dig? Where can you see why?

Answer 1

Look at the logs or enable error reporting in Drupal (via drush or via settings.php: $config['system.logging']['error_level'] = 'verbose';) to see the cause of the error. And don't forget to turn it off =)