Kirby is a CMS that uses PHP as a programming language. It was quite new to me at the time while working on VPRO Studentenprotesten website.
At the time of writing this (december 2024) it’s been quite a while since I last used kirby and tweaked the YAML files and wrote PHP.
This is the site.yml in the blueprints folder, it gives a structure to all the different fields in the CMS. Like the types of help labels at the bottom of the screen.

And in the chapter section, which contains the texts you see when hovering over videos or when viewing certain videos.
