← Azure FundamentalsAZ-900 Concepts
Concept Guides
AZ-900 Concepts
Explained One at a Time
Short, focused guides on the specific concepts that trip candidates up most often — each with a practice question at the end.
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🏗️
IaaS vs PaaS vs SaaS
The responsibility ladder, explained clearly.
💾
Storage Redundancy Explained
LRS, ZRS, GRS, and GZRS — what each protects against.
🔐
RBAC vs Azure Policy
Who can act, versus what is allowed to exist.
🌍
Availability Zones vs Region Pairs
Two layers of resilience, at different scales.
💰
Reserved Instances vs Spot Pricing
Matching pricing models to workload type.
🪪
Microsoft Entra ID Explained
Identity, MFA, and Conditional Access.
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