What are the AWS essentials?
AWS has hundreds of services, but a handful cover most needs: EC2 for compute, S3 for object storage, VPC for networking, RDS for databases, and IAM for access. Learning these core building blocks deeply beats skimming the entire catalog.
Why it matters
AWS is the largest cloud provider, and its core concepts transfer to every other cloud. Knowing how compute, storage, and networking fit together lets you deploy real systems and reason about cost and security. It is among the most requested DevOps skills in hiring.
What to learn
- Regions and availability zones
- EC2 instances and when to use them
- S3 object storage and its access model
- VPC, subnets, and security groups
- RDS for managed databases
- IAM as the access foundation
- The shared responsibility model
Common pitfall
Leaving an S3 bucket or security group open to the world. Public buckets are a recurring source of major data leaks, and an open security group invites attackers straight in. Default to private, grant the narrowest access that works, and double-check anything labeled "public" before you create it.
Resources
Primary (free):
- AWS — Getting started · docs
- AWS — Well-Architected Framework · docs
- AWS — Free tier · tool
Practice
In a free-tier account, launch a small EC2 instance in a VPC, restrict its security group to your IP, and serve a simple page. Create a private S3 bucket and upload a file. Tear everything down afterward. Done when the instance is reachable only from your IP and the bucket is not public.
Outcomes
- Explain regions, availability zones, and the core services.
- Launch compute inside a VPC with a scoped security group.
- Use S3 with a private-by-default access model.
- Apply the shared responsibility model to a deployment.