The site navigation consists of 3 parts:
1. The top orange bar shows the top sections of the site. Clicking on a section will bring you to the top level of that section.
2. The sidebar on the left contains the position where you currently are (in bold) and links to go down deeper in the site.
3. The information on the page may also contain links deeper into the site. Your current position is always displayed in the sidebar on the left however.
4. The commands-menu is always at the top-right and shows you the commands you can execute. These commands are login/logout or add question, add discussion topic or reply where appropriate.