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I actually prefer the way it is. When there are too many links around, I tend to do some DFS-like reading and it ends up anxiety and tons of tabs. Things get worst when there're loops.

There's a lesson overview on the left-side navigation, and an inner-lesson table of contents on the right-side navigation, which links to each topic or learning objective.

If you're on a narrow format it looks like that table of contents is set into the top of the article below the lesson title.

I found that turning my tablet sideways revealed a sidebar with links to each section of the courses. Sometimes responsive UI is not better.