Delphi 12.2 introduced a new text-processing engine, WebStencils, that can be used in WebBroker and other applications to generate HTML and other template-based text. To get my head around how to work with this, I wrote a couple of small WebBroker applications, one using PageProducers and the other doing the same thing using WebStencils. You can read about it in my latest blog entry, Introducing WebStencils and download the projects from Github.
I hope this is useful for learning about this new text-processing engine.