Echo other comments that say full samples with Razor Pages are needed.  Everything is almost the same, but not the same and nothing is clear.  Yes, you can get everything to work if you spend enough time searching, but that is not the same as "Completed".  

Razor pages are now the default for ASP.Net Core and samples should have the same as the primary.

Finding clear information about Razor pages and what works the same and what does not work is really difficult.  Any responses found here or in the forums are superficial and often give a very simple sample that is not helpful for any complex scenario.

A full sample application written in the Razor pages format is needed and documentation that does not just assume a robust MVC approach with controllers.  For instance, any example where an update is done through a razor page Handler method using ajax rather than a controller action...or if not possible, is that coming or not?  Either way, it needs to be documented clearly.   

now that MS are ending support for web-forms and appear to be promoting .Net Core and Razor as preferred replacement this should be a priority

I have been struggling with this too.  Cannot get it to work and clear instructions/documentation needs to be created asap.