# Core Azure Things

- [Regions](/az-900-notes/core-azure-things/regions.md)
- [Region Pairs](/az-900-notes/core-azure-things/region-pairs.md)
- [Geographies](/az-900-notes/core-azure-things/geographies.md)
- [Availability Options](/az-900-notes/core-azure-things/availability-options.md)
- [Availability Sets](/az-900-notes/core-azure-things/availability-sets.md)
- [Availability Zones](/az-900-notes/core-azure-things/availability-zones.md)
- [Resource Groups](/az-900-notes/core-azure-things/resource-groups.md)
- [Resource Manager](/az-900-notes/core-azure-things/resource-manager.md)