- Training Library
Recommended Reading for AZ-900
The resource is part of this learning path
Before taking Microsoft's AZ-900 exam, you should read the documentation at the following links to familiarize yourself with these topics.
Lock resources to prevent unexpected changes - Read the introduction, How locks are applied, and Who can create or delete locks.
Hierarchy of management groups and subscriptions - You do not need to read the whole page, just this section. This is the case for the links below as well.