It's common to add some configuration options to site.yaml, to be shown in the site content.
To make those options configurable via Admin panel, add some fields to
user/blueprints/config/site.yaml. For example:
@extends: '@parent' form: fields: content: fields: myfield: type: text label: My Field
Will add the 'My Field' input type, appending it to the Content section of the Site configuration.
You can add entire new sections too, for example:
@extends: '@parent' form: fields: anothersection: type: section title: Another Section underline: true fields: myfield: type: text label: A label size: large
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