...
You are currently on the home page for the Knowledge Base. Below this text, you see (in two columns) the table of contents of the Help Documentation (on the left) and a list of New Page Edits, meaning recently-edited or created help entries (on the right).
When you navigate to a certain section of the Help Documentation, the Navigation Pane will display (if applicable) that page's table of contents and list of subpages.
...