Categories
At some point it becomes useful to classify the information according to categories. An example of a category in use is this Help page (see link at the very bottom). To create a category, simply add (for each category) a line as follows: [[Category: Name of Category]] Typing this:
[[Category:Cardiology]]
Adds the page to the Category of Cardiology chapters.
It is convention to insert these lines near the bottom of the wiki page. Once your edit is saved, the category will exist and add the page to it.