There are a variety of different navigation tools used in Drupal:
The core Menu module provides out-of-the-box audience side menu functionality
The Book module provides its own contextualized navigation block
The Admin Toolbar provides a very nice drop-down administrative toolbar that makes working on the site much easier
Shortcuts can be created and provided to your site members
These are a few examples. Additionally, using more advanced Drupal components, you can create custom features that perform dynamic navigational options.
Let's take a look at some different navigation related topics that you might encounter on your OSU Drupal 8 site.