There is no documentation.

I've created a site that provides training:  https://ingentius.com/

In it, I have article categories that are labeled as "courses."

The articles in the category are the lessons.

The last lesson is a link to a quiz.

Simple - effective.

In Community Quiz the "course" is what?  How does it relate to a learning path?

On the front end, it displays the "long description"

Under it the "Course Content" displays the assigned quiz.

If I want to add lessons to it, how?

Thanks in advance.