Amazon EC2

1. Core concepts and architecture

   Instances, AMIs, instance types, regions and Availability Zones, key pairs and the basic building blocks of EC2.

2. Amazon Machine Images

   AMI contents, creating and copying AMIs, sharing, deregistering, and root device types.

3. Instance types

   Instance families, sizes, Nitro system, burstable and accelerated computing types and how to choose one.

4. Purchasing options

   On-Demand, Reserved Instances, Savings Plans, Spot Instances, Dedicated Hosts and Capacity Reservations.

5. Instance lifecycle

   Pending, running, stopping, stopped, hibernation and terminated states and what each means for billing and data.

6. Launch templates

   Reusable launch parameters, template versions and how fleets and Auto Scaling consume them.

7. Instance metadata

   IMDS, IMDSv2 session tokens, user data and retrieving instance identity from inside an instance.

8. Networking

   Elastic IPs, network interfaces, placement groups, enhanced networking and Elastic Fabric Adapter.

9. Security groups and key pairs

   Stateful security group rules, key pair access and how instance-level traffic filtering works.

10. Storage options

    EBS volumes, instance store, root volumes and block device mappings attached to instances.

11. EC2 Fleet and Spot Fleet

    Fleet request types, allocation strategies and mixing On-Demand and Spot capacity.

12. Monitoring EC2

    Status checks, CloudWatch metrics, detailed monitoring and instance health alarms.

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