A fullstack-focused guide to AWS VPC networking and Security Groups, explaining core components (subnets, route tables, IGW, NACLs) and instance-level firewalls, with best practices (network segmentation, least privilege, precise ports, regular reviews), and a step-by-step web/e-commerce deployment example using EC2, RDS, and S3 to implement defense-in-depth and scalable, secure architectures.
