Tours are used to aggregate other document instances, especially topics. They are of a means to take an alternative walk through the documentation.

Sections do not stand for their own. That is, if the parent document is removed, section documents are also removed (or their information is moved to other documents where the fit better according to recent understanding).

Modules help to create modular content for single sourcing. These modules are transcluded by topics (and instances of other document types).

A generic document is like a topic, but has no default storage space. It is usually a related to another document. Use this doctype if you do not want the document instance show up in an index.

Typically you should either select Topic 62062623 or Section instead of a generic document.

Besides the generic organization types Subject, Category, and Tag this type-specific category allows to create additional views on the set of topics.