Azure SQL Database

1. SQL Database overview

   SQL Database overview for Azure SQL Database: PaaS SQL, the key concepts and settings to know.

2. Purchasing models

   Purchasing models for Azure SQL Database: DTU and vCore, the key concepts and settings to know.

3. Serverless

   Serverless for Azure SQL Database: Serverless, the key concepts and settings to know.

4. Elastic pools

   Elastic pools for Azure SQL Database: Pools, the key concepts and settings to know.

5. High availability

   High availability for Azure SQL Database: HA, the key concepts and settings to know.

6. Active geo-replication

   Active geo-replication for Azure SQL Database: Geo-replication, the key concepts and settings to know.

7. Backups

   Backups for Azure SQL Database: Backups, the key concepts and settings to know.

8. Security

   Security for Azure SQL Database: Security, the key concepts and settings to know.

9. Firewall rules

   Firewall rules for Azure SQL Database: Firewall, the key concepts and settings to know.

10. Query performance

    Query performance for Azure SQL Database: Performance, the key concepts and settings to know.

11. Resource limits

    Resource limits for Azure SQL Database: Limits, the key concepts and settings to know.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.