The most obvious reason why people interact with the elearning course is to navigate from one point to the next. The “next” button is the most common form of interaction. We click it to navigate from one screen to another.
Of course, there are all sorts of others ways to navigate content. It could be an onscreen button, like a gate screen that we click to advance. Or perhaps it’s something like … a slider instead of next buttons to navigate from one screen to the next.