The course is organized by topics/chapters, clicking on which will open the list of study topics. Clicking on any subject will display it in the center of the screen.
Each subject has several pages that can be browsed by clicking on "Previous/Next" at the bottom of the page.
Every time we move to the next topic, the system will mark it as "read" (in green), so that every time we re-enter the system, we will know where we were last time.
Some topics are long and you have to scroll down to see all the content. If we do not scroll to the end, the topic will not be marked as "read".