A good place to start is

1) A quick overview
https://stopware.com/products/passagepoint-software/passagepoint-global

2) How to videos:
https://stopware.com/passagepoint-video-library-learn-more-about-passagepoint
https://stopware.com/passagepoint-webinar-series

3) A "how to" install (new and upgrades)
https://stopware.com/support/product-launcher

4) KB articles Database
https://support.stopware.com/portal/en/home


5) manuals:
http://downloads.stopware.com/docs/global/PassagePointUsersManual.zip
 http://downloads.stopware.com/docs/global/PPGlobalAdminManual.zip