Permission level can only be created by Site Collection administrators or Farm level administrators. For that reason, creating and modifying permission levels is outside the scope of this course. What we will do is view the granular permissions that are combined in a permission level. The permission levels usage you have already seen in the earlier demonstration when we created a new SharePoint group. You can also assign a permission level directly to a user or group, Windows users and groups typically, but this is not recommended.
This walk-through will view the granular permissions that are assigned to the Full Control permission level.
Note that the Permission Levels link button is only available at the root site of the Site Collection.