suppose to have this scenario: An Area and two Pages (page1 and page2) inside. If you want to show the links related to the Area and the pages, you have to enable the Landmark Properties on the Area and on these pages. In this example the level ""2"" refers to the content of the main Area (page1 and page2).
Moreover if there are other nested Areas you have to keep in mind that the iteration of the Landmarks refers on the current visited Area/Page. So you can create your menu by adding nested iteration for the nested Areas and Pages to your template. In this case you can refer to the wr:Current and wr:NonCurrent tags.
For more details you can refer to this article of our wiki:
Create a Style Project from a mockup