You build an outline by linking documents together in a way that best conveys the information that you want to communicate to your audience. Although there are several ways to create documents, you must use the Outline Editor to define the outline by linking module/section and topic documents to one another. For example, you can create new documents from the Library without any links and then use the Outline Editor to design the outline by linking the various documents that you have created in the Library. You can also create the outline "on the fly" by linking new documents directly from the Outline Editor.
Consider the following before deciding how to build your content:
Regardless of how you build content, you will use some combination of module, section, and topic documents.