A concise guide for full-stack devs to AWS essentials: compute (EC2, Lambda, Elastic Beanstalk), storage/database (S3, EBS, RDS), and security (IAM, KMS, Inspector), anchored by AWS's global footprint (25+ regions, 77 AZs, 200+ edge) for low latency, resilience, and DR; includes a media-streaming use case showing how these services combine to build scalable, secure, high-performance platforms.