Except for the Super Admin role, the Administrator role is the most powerful of all of the six built-in user roles that come with WordPress.
When you first install WordPress, an Administrator role is automatically created. You will be prompted to create the username and password for this role. As the Administrator, you can do absolutely everything on your WordPress site, including and up to deleting all WordPress files (and, therefore, the website).
The Administrator can also add new users and assign them user roles as well as edit their user roles. Because the Administrator role comes with so much power, you should always be extremely careful before assigning the Administrator role to other people.
The Administrator can also upgrade the theme, upgrade the version of WordPress, upgrade plugins, change the theme, install or deactivate plugins and access and modify WordPress’s core coding. The Administrator can also change all of the settings for a WordPress site. Administrators can also manage comments and content produced by other users, including deleting it. Essentially, there are no restrictions on what the Administrator can do with regards to a single WordPress website.
The only limitations to the Administrator role are when you are administering multiple websites in a united network. To access some of those settings, you’ll need to have the user role of Super Admin.
Note: If you are only operating one WordPress site, there is no need to give yourself Super Admin privileges.