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Every resource you run in AWS — an EC2 instance, an RDS database, a load balancer — sits inside a network. That network is the VPC: a private, isolated slice of the AWS cloud that you control. Understanding it means understanding how traffic actually reaches your resources, and how you keep them protected. The single most important distinction to walk away with is security groups versus NACLs, so that gets special attention below....

Once an app is running on AWS, the next question is: how do you know if it is actually okay? AWS gives you a handful of services to watch performance, audit who did what, trace requests across systems, and check the health of AWS itself. The mental map ┌─────────────────────────────────────────────────────────┐ │ WATCH performance & react │ │ • CloudWatch Metrics (numbers: CPU, network, billing) │ │ • CloudWatch Alarms (trigger on a metric) │ │ • CloudWatch Logs (collect log files) │ │ • EventBridge (react to events / schedule) │ ├─────────────────────────────────────────────────────────┤ │ AUDIT who did what │ │ • CloudTrail (API call history / audit) │ ├─────────────────────────────────────────────────────────┤ │ TRACE & analyze app behavior │ │ • X-Ray (trace requests across services) │ │ • CodeGuru (ML code review + profiling) │ ├─────────────────────────────────────────────────────────┤ │ CHECK service health │ │ • Health Dashboard (Service) (all AWS, all regions) │ │ • Health Dashboard (Account) (events impacting YOU) │ └─────────────────────────────────────────────────────────┘ CloudWatch — the core monitoring service Metrics CloudWatch Metrics are numbers tracked over time — CPUUtilization, NetworkIn, and so on....

Once an app grows past a single service, the pieces need to talk to each other — but you don’t want them tightly coupled. AWS’s messaging services are the glue: they let one part of your app hand off work or events to another without either side having to know much about the other. The mental map ┌─────────────────────────────────────────────────────────┐ │ PATTERN 1: One-to-one (queue) │ │ • SQS (producer → queue → one consumer) │ ├─────────────────────────────────────────────────────────┤ │ PATTERN 2: One-to-many (pub/sub) │ │ • SNS (publisher → topic → many subscribers) │ ├─────────────────────────────────────────────────────────┤ │ PATTERN 3: Real-time data streams │ │ • Kinesis (continuous data → process → store) │ ├─────────────────────────────────────────────────────────┤ │ PATTERN 4: Industry-standard protocols │ │ • Amazon MQ (managed RabbitMQ/ActiveMQ for migration)│ └─────────────────────────────────────────────────────────┘ SQS — Simple Queue Service SQS is a managed message queue....

AWS has data centers everywhere. A handful of services help you actually use them — to route users to the right place, speed up the trip, or bring AWS closer to where the trip ends. The mental map ┌─────────────────────────────────────────────────────────┐ │ ROUTE traffic globally │ │ • Route 53 (DNS — where to send users) │ ├─────────────────────────────────────────────────────────┤ │ CACHE / ACCELERATE content │ │ • CloudFront (CDN — cache at edge) │ │ • S3 Transfer Accel (faster uploads to S3) │ │ • Global Accelerator (faster routes, no cache) │ ├─────────────────────────────────────────────────────────┤ │ EXTEND AWS to other places │ │ • Outposts (AWS racks in your data center) │ │ • WaveLength (AWS in 5G telecom datacenters) │ │ • Local Zones (AWS in metro areas near users) │ └─────────────────────────────────────────────────────────┘ Route 53 — global DNS Route 53 translates myapp....

Once you understand the building blocks of AWS, the next question is practical: how do you get an app onto AWS, and how do you manage it afterward? Five services cover this, and they group neatly by the job they do. The mental map ┌─────────────────────────────────────────────────────┐ │ DEFINE infrastructure as code │ │ • CloudFormation (YAML/JSON templates) │ │ • CDK (real code → compiles to CFN) │ ├─────────────────────────────────────────────────────┤ │ DEPLOY applications │ │ • Elastic Beanstalk (PaaS, all-in-one) │ │ • CodeDeploy (push code to existing fleet) │ ├─────────────────────────────────────────────────────┤ │ MANAGE running infrastructure │ │ • Systems Manager (SSM) │ └─────────────────────────────────────────────────────┘ CloudFormation CloudFormation is declarative AWS infrastructure as code....