Adding region metadata to your THEMENAME.info.yml file
Printing the region as a Twig variable in your page.html.twig file (and page template variants)
Important Note: If you declare any regions in your theme, even just one, all the default regions will no longer be applied and you assume responsibility for declaring any and all regions you want to use.
Drupal core includes features that support accessible websites and authoring. They provide a foundation for site builders, content authors, developers, and themers. They do not make every Drupal site accessible. Configuration, contributed projects, custom code, themes, and content can change the result.
The examples below describe Drupal 11.x. Review and test the Drupal version and configuration used by your site.
When creating a custom content type the first step is to set the base configuration for the content type. After that you may optionally add one or more fields.