Hi Architekt,
It is clearly defined in the section management group, basically deep down the links it list the specific info and what you can deploy under each Landing zones - https://learn.microsoft.com/en-us/azure/cloud-adoption-framework/ready/landing-zone/design-area/resource-org-management-groups.
For many organization, the default Corp
and Online
management groups provide an ideal starting point
Also there is a Bicep File for this deployment and you can review - https://github.com/Azure/ALZ-Bicep/blob/main/infra-as-code/bicep/modules/managementGroups/managementGroups.bicep
Hope this helps.
JS
==
Please accept as answer and do a Thumbs-up to upvote this response if you are satisfied with the community help. Your upvote will be beneficial for the community users facing similar issues.