The layout of recent textbooks often contains remarks, notations, different colours to motivate the students to continue, to give comprehension aids and to show connections to other parts of the book. This kind of layout is a well-considered didactic design.
You can improve the structure of your Moodle course as well with several rail guards to lead the students and to offer a more user-friendly design. The key for this is an element of Bootstrap. It is as easy as copy and paste.

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