Why do I get the ‘failed to drop or create the database’ or ‘Access denied for user’ warnings when installing Drupal Starter Kits locally?

Your settings file is either not set or misconfigured. Drupal will automatically copy default.settings.php to settings.php if it does not exist. Drupal Starter Kits add Acquia-specific settings configuration for the database to this file during the Composer install process. Drupal Starter Kits have no opinion or direct knowledge of any local development environments other than Cloud IDEs. For information about setting up the correct database settings, see the install documentation of your local dev environment of choice.