Hi
the most basic change is that there is a site_url value in the sitedetails table in the database so you'll need to change that so the value is correct.
But typically there are other things to consider e.g.
authentication configuration
LTI configuration, integration and LTI links in VLE/LMS etc
Existing public links to projects in other places and what happens with those as a result of the changed url
There are possibly other things like firewall rules and other integrations etc
HTH
Ron