There are a few things you'll want to do with your application before moving into production.
The bootstrap.php
file covers most of the global settings that would change between environments.
Generally you should make the following 3 changes:
PRODUCTION
Change the url.php
configuration and edit the trusted_hosts
section.
Add your production environment domain(s) into the list and remove the developing environment domain(s).
Also check your other configuration files (for example if you use the Database Module check your database.php
configuration file).