# AZ-900 Cheat sheet

I created a short AZ-900 cheat sheet while studying, and it turned into a very useful way to organize the fundamentals.

For me, the most helpful part was turning the concepts into simple mental models and quick comparisons:

- IaaS / PaaS / SaaS.
- CapEx vs OpEx.
- Azure Policy vs Blueprints.
- Azure Monitor vs Service Health.
- VM basics, Bastion, storage redundancy, and RBAC.

The goal was not to create a giant study dump, but a short, practical cheat sheet that is easy to scan and remember.

Link: [AZ-900 cheat sheet](https://www.linkedin.com/pulse/az-900-fundamentals-cheat-sheet-patrick-koorevaar-yoiif/)

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*Co-authored with Claude.*

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