Class section tagging is making a note on certain sections to indicate a particular characteristic, such as No Cost/Low Cost Course Materials, Civic Learning or Sustainability Content. You can find section tags under Course Attributes in Navigator.
Log into your Navigator, and select the semester, department, and academic group, and then click to expand COURSE ATTRIBUTE (where you can search for Gen Eds or if it's Hybrid). The three new section tags are

Are you wondering what classes have tags? Browse these lists of Undergraduate Day Classes.
Some classes might have multiple tags, and may appear on multiple lists.