Hello,
I noticed that the following production ready sites:
are made using Wolfram’s web-templating technologies.
May I know if there is a good resource for an absolute beginner to gain expertise on this topic?
As far as Wolfram Cloud APIF function and Form function are concerned we know how it works.
I asked moderators to edit your post and add hyperlinks to the services. It would be very convenient if next time you could do that yourself so people can actually follow easily the things you mention.
Now to your question. All this sites have the code explanation:
If you mean the actual final nice outlook of the site I think it was a custom HTML design and not Wolfram templates. You can deploy HTML to the web:
CloudDeploy[ExportForm[Import["http://example.com/", "Source"], "HTML"]]