Difference between attribute groups and business classifications

Good morning,

I am trying to figure out the best way to setup some certifications for my organization.  Could someone point me to documentation that explains when business classifications or attributes should be used.  I am also having trouble finding documentation on configuring Business Classifications.  I am able to create new business classifications with the application developer responsibility. But cannot link LOV's or select the value set type from there.  The setup for the attribute groups are all in the web form under the supplier administrator responsibility but there is no configuration for the business classifications there with that responsibility.