What is?
https://www.drupal.org/docs/8/api/form-api/configformbase-with-simple-c…
This is used to create forms for configuration pages on your Drupal website. An admin interface enables you to make a module’s settings configurable by a site editor or administrator so they can change them on the fly.
How to use?
- Declare your form route using Routing yml generator
- Add new form using Configuration form generator.
- Add configuration schema
- You can add menu link for your configuration