Configuration: domain
When you first create a WordPress site, it is likely to have a domain different from the one you will launch.
Once you are happy with the content of your site you will want to point your existing country/region domain (or purchase a new one) to the new site. Once you pointed your domain to your hosting provider (this step is beyond the scope of this article), you will need to update the WordPress to start using this new domain.
To do so go to Settings -> General
Update WordPress Address (URL) and Site Address (URL) with the new domain. Make sure to include http(s):// as part of the url.
On the same screen you can update the Site Title and Tagline (optional) as well as the Administration Email Address.
If, after changing the domain name, you experience errors on the site such as broken images or links you might have to install and use 'Better Search Replace' plugin. This plugin will scan your website for old url in image paths or links and will replace it with a new one. See plugin documentation on how to use it.