Concepts
Core AWS concepts and architecture patterns: regions, availability zones, the Well-Architected Framework, shared responsibility model, scaling, high availability, and disaster recovery.
AWS Shared Responsibility Model: Who Secures What?
The AWS Shared Responsibility Model defines who owns security OF the cloud (AWS) vs IN the cloud (customer). Learn how it varies by EC2, Lambda, S3, and RDS.
AWS Regions Explained: How to Choose the Right Region
An AWS Region is a geographic area with 3+ Availability Zones. Learn how 30+ Regions work, selection criteria for latency, compliance, cost, and service availability.
High Availability on AWS: Multi-AZ Patterns & SLA Tiers
High availability on AWS means designing for 99.9%–99.999% uptime using Multi-AZ deployments, load balancing, auto-scaling, and managed database HA patterns.
AWS Disaster Recovery: 4 Strategies from Backup to Active
AWS disaster recovery spans 4 strategies — Backup & Restore, Pilot Light, Warm Standby, Multi-Site Active/Active — with defined RTO and RPO targets per tier.
AWS Well-Architected Framework: The 6 Pillars Explained
The AWS Well-Architected Framework codifies best practices across 6 pillars: Operational Excellence, Security, Reliability, Performance, Cost, and Sustainability. Learn each.
AWS Step Functions: Serverless Workflow Orchestration
AWS Step Functions orchestrates Lambda, ECS, and other AWS services into durable state machines. Learn Standard vs Express workflows, ASL, error handling, and pricing.
Amazon SQS: Message Queue Service on AWS Explained
Amazon SQS is AWS's managed message queue service. Learn Standard vs FIFO queues, visibility timeout, dead-letter queues, polling, pricing, and when to use SQS vs SNS or Kinesis.
SQS vs SNS: When to Use Each (and the Fan-Out Pattern)
Compare Amazon SQS (pull-based queue) vs Amazon SNS (push-based pub/sub). Learn the SNS→SQS fan-out pattern, when to pick each, and how EventBridge fits in.
Amazon SNS: Pub/Sub Messaging for AWS Explained
Amazon SNS is AWS's managed pub/sub service. Learn topics, subscriptions, fan-out to SQS/Lambda/email/SMS, FIFO topics, message filtering, and when to use SNS vs EventBridge.
Availability Zone (AZ): What It Is and Why It Matters
An AWS Availability Zone is one or more discrete data centers inside a Region with redundant power, networking, and cooling. Learn how AZs enable high availability and how to design for multi-AZ.