question

Some info can be found here.
https://docs.microsoft.com/en-us/learn/certifications/exams/az-900

MVA learning is not currently supported here on QnA. They're actively answering question in dedicated forums here.
https://trainingsupport.microsoft.com/en-us/

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Here are different resources where you can get them:

https://www.whizlabs.com/microsoft-azure-certification-az-900/
https://www.measureup.com/microsoft-azure-fundamentals.html
https://www.udemy.com/course/az900-azure/

More importantly, I also recommend you these trainings materials:
AZ-900 Azure Fundamentals Hints and Tips Very good video (~1 hour) from John Savill who's always explaining things very well.
Explore Microsoft Azure cloud concepts (AZ-900) Official Microsoft Learning material part 1
Distinguish Microsoft Azure Core Services (AZ-900) Official Microsoft Learning material part 2
Examine Microsoft Azure security, privacy, compliance, and trust (AZ-900) Official Microsoft Learning material part 3
Review Microsoft Azure pricing, service level agreements, and lifecycles (AZ-900) Official Microsoft Learning material part 4
AZ-900 Live – Azure Fundamentals #1: Exam Overview and Cloud Concepts First video in this new video series on preparing for AZ-900 from Nick Colyer

--I hope this helps. Please Accept it as an answer and "Up-Vote" the answer or message(s) that helped you so that it can help others in the community looking for help on similar topics

Regards,
Didier3001