Manage vocabularies of keywords that allow you to classify content with. Content tagged with these keywords can then be searched, sorted, or filtered accordingly.
Add Terms to a Vocabulary
In the Taxonomies list, click on 'add terms', to the right of the appropriate vocabulary
Add the name for the term as well as a brief description
Expand the 'Relations' field to define a relationship with a 'Parent term'
For example: you might choose to create a relationship between "CompSci 1015" and "Summer Semester 2016"