Welcome back. ??
To answer this and clarify this, I will have to fist tell how the ‘Learn page’ works.
Whenever you start any course, it opens of a learning page consisting all the lessons and quizzes of that particular course. Now, ‘Learn Page’ under Pages just remains to run this learning page for each course. The content of the ‘Learn Page’ itself is irrelevant and it will not show anywhere. So, you don’t need to edit the content of ‘Learn page’, please keep it as it is without deleting the page.
Now, when you start any course, you are in one of your lessons of that particular course. The video added to the lesson will show at top just below lesson title and the lesson description will show below the video. So, if you are looking to add content for each lesson within the course, lesson description is the thing that you need to add. Please check Add new lesson section in this doc. Also, video is like the main content for any lesson, we show it right at top before the lesson description to highlight it.
Please let me know if this clarifies your query or not. Also, if you have any suggestions on this matter, I would be happy to hear those.
Thanks.
Sanjip S.