Hi email@example.com (mind if I call you TR?) - The main landing page for app information is here: Mobile Guides - Canvas by Instructure . From here, students (and faculty) can chose their app's OS, and then--as you will see--there are links to student-specific information from there. There is a brief overview video available at the top of this page: https://community.canvaslms.com/community/answers/guides/video-guide , though the rest of the videos there tend to be more for the web version.
Hope this helps a bit!