Master AWS Cloud Computing From Scratch

Clear, interactive, and structured AWS lessons designed for absolute beginners.

COURSE SYLLABUS
1. AWS Introduction
Introduction to AWS What is AWS? AWS Global Infrastructure AWS Management Console AWS Account Setup Root User vs IAM User Free Tier & Billing Safety
2. Identity & Access Management
Introduction to IAM IAM Users IAM Groups IAM Policies IAM Roles Multi-Factor Authentication
3. Amazon EC2
Introduction to EC2 EC2 Basics EC2 Instance Types Launch an EC2 Instance Security Groups Key Pairs Elastic Block Store (EBS)
4. Amazon S3
Introduction to S3 S3 Concepts S3 Buckets S3 Objects & Keys Versioning Bucket Policies
5. Amazon VPC
Introduction to VPC VPC Concepts Subnets Route Tables Internet Gateway NAT Gateway VPC Security Groups
6. Amazon RDS
Introduction to RDS RDS Concepts Database Engines Create RDS Database Backups
7. AWS Lambda
Introduction to Lambda Lambda Concepts Lambda Functions Triggers Environment Variables
8. Amazon CloudWatch
Introduction to CloudWatch CloudWatch Concepts Metrics CloudWatch Logs Alarms
9. Elastic Load Balancing
Introduction to Elastic Load Balancing ELB Concepts Application Load Balancer (ALB) Network Load Balancer (NLB) Gateway Load Balancer Target Groups Health Checks Listeners & Rules

NAT Gateway

A NAT Gateway allows resources in a private subnet to initiate connections to destinations outside the VPC without accepting unsolicited inbound connections from the internet.

Why it matters

Private workloads may need software updates or outbound API calls while remaining unreachable from the public internet.

How it works

Create NAT Gateway in a suitable public subnet → private route table sends 0.0.0.0/0 to NAT → outbound traffic exits through NAT.

Real-world example: A private application server downloads packages or calls an external API through NAT.

Core Concept

A NAT gateway is commonly placed in a public subnet.

Private subnet route tables can send internet-bound traffic to the NAT gateway.

VPCPublic SubnetLoad BalancerInternet Gateway routePrivate SubnetApp / DatabaseNo direct inbound internet

What you should remember

Key idea

A NAT gateway is commonly placed in a public subnet.

Key idea

Private subnet route tables can send internet-bound traffic to the NAT gateway.

Real-world example

Use a realistic cloud workload and focus on the responsibility of this AWS service.

User → AWS service → application → data / response

Choose the service that matches the responsibility instead of forcing every workload into one resource.

# Conceptual workflow aws-service --resource example # Verify configuration → test → monitor → clean up
Practice tip: Build the smallest possible lab, verify the result, then remove resources you no longer need.

Quick Test

1 Question

What is the main idea of this AWS lesson?

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