Changing your navigation in Canvas is an easy way to you shape your online course. For learning effectiveness, having fewer menu items streamlines the student user experience. By hiding items your students aren't going to use, you simplify the look and feel of your Canvas course.
You can also "hide" content types -- one example would be the Files menu item-- that you would prefer to reveal to students through in-page links or via your modules page.
This video gives you a quick guide to using your settings page navigation tab to order and hide or disable items that aren't essential to your instruction.
More from the Canvas guides here:
How do I manage Course Navigation links?