S3

Standard, Intelligent-Tiering, Glacier and Deep Archive compared on cost/retrieval time, plus lifecycle rules that move and expire objects automatically.

Production-grade static site delivery pipeline using S3 origin storage, CloudFront edge caching, ACM-issued TLS, Route53 DNS, and Cloudflare in front for extra security and performance.

Full dynamic web application stack on EC2 with an RDS-backed database, CloudFront + S3 for static assets, ACM TLS, Route53 DNS, and Cloudflare protection in front of the origin.

Real questions asked in AWS Cloud, DevOps, and Solutions Architect interviews — IAM, EC2, S3, VPC, RDS, CloudFront, and cost/architecture tradeoffs.

The AWS global infrastructure: regions, availability zones, and the console/CLI.

Users, roles, policies, and the principle of least privilege.