The permissions to create a Knowledge Center are separated from the
community creation rights. Typically a small set of high level administrators
will be able to setup Knowledge Centers.
Once in the settings page, users can select the relevant metadata among
the various SharePoint term sets available in that installation. They can also
decide if tagging will be mandatory or optional for users sharing
knowledge. If mandatory is selected users will be forced to use at least one
metadata for each update.
Owner will also define the privacy and visibility, upload a banner image to
brand the Knowledge Center and add other owners to distribute admin
rights over this specific space to other employees.