GPS Function End to End - Basic Intro Video
This video shows the basic end-user and Contact Tracer flows for the GPS Solution, and may be a useful basic intro to the products.
https://drive.google.com/file/d/1aamhaxFAZAbdQSVRjjTD_hKUUK-ZEu3M/view
It does not include all the details you may need to configure your test environment to execute these flows - for that see these resources: