HLD / Analysis Google Document will include information that relates to the (at least preliminary) metadata.yml, including:

Prereq relationships (e.g. you may want to review A before taking this lesson/course)

Taxonomies (Level, Topic, Products, Audience)

Parent / Child / Sibling Relationships (as defined by the lesson order in the course)

What's Next relationships (e.g. review B after taking this course/lesson to find out more)

Until Catalog Manager exists, we should map the analysis info to the metadata.yml fields to help devs avoid confusion.