AWS Cloud Fundamentals: Your First Steps to Cloud Computing

Cloud computing delivers computing services — servers, storage, databases, networking — over the internet ('the cloud'). Instead of buying physical hardware, you rent resources on-demand.

AWS (Amazon Web Services) is the world's largest cloud provider with 33% market share, offering 200+ services across 30+ global regions. Companies like Netflix, Airbnb, and NASA use AWS.

Key benefits: Pay only for what you use, scale up/down instantly, global reach in minutes, enterprise-grade security, and 99.99% availability SLAs.

AWS certifications are among the highest-paying IT certifications. AWS Solutions Architect earns an average of ₹12-25 LPA in India, making it one of the best career investments.

Go to aws.amazon.com and click 'Create an AWS Account'. You'll need an email, password, and a credit/debit card (you won't be charged within Free Tier limits).

The AWS Free Tier includes: 750 hours/month of EC2 t2.micro, 5GB S3 storage, 750 hours of RDS, and 1 million Lambda requests — all free for 12 months.

Enable MFA (Multi-Factor Authentication) on your root account immediately. Go to IAM → Security Credentials → Assign MFA device. Use Google Authenticator or Authy.

Create an IAM admin user instead of using root. Go to IAM → Users → Add User → Attach 'AdministratorAccess' policy. Use this user for daily operations — never use root for regular tasks.

EC2 (Elastic Compute Cloud) provides virtual servers. Launch your first instance: EC2 Dashboard → Launch Instance → Select Amazon Linux 2 → t2.micro → Create key pair → Launch.

Connect to your EC2 instance via SSH: 'ssh -i your-key.pem ec2-user@public-ip'. On Windows, use PuTTY with the converted .ppk key file.

S3 (Simple Storage Service) is object storage for files. Create a bucket: S3 → Create Bucket → Choose unique name → Select region → Block all public access (recommended for learning).

IAM (Identity and Access Management) controls who can access what. Key concepts: Users (people), Groups (collection of users), Roles (for services), Policies (JSON permission documents).

VPC (Virtual Private Cloud) is your isolated network in AWS. Every AWS account gets a default VPC, but understanding custom VPCs is essential for real-world deployments.

A VPC contains subnets (public and private), route tables, internet gateways, and NAT gateways. Public subnets have internet access; private subnets are for databases and internal services.

Security Groups act as virtual firewalls for EC2 instances. They are stateful — if you allow inbound traffic, the response is automatically allowed outbound.

Best practice: Follow the principle of least privilege. Only open ports you need (e.g., port 22 for SSH, port 80/443 for web). Never open port 22 to 0.0.0.0/0 in production.

Deploy a simple web application: Launch an EC2 instance → Install Apache ('sudo yum install httpd -y && sudo systemctl start httpd') → Open port 80 in Security Group → Access via public IP.

Explore more services: RDS for managed databases, Lambda for serverless functions, CloudWatch for monitoring, and Route 53 for DNS management.

Prepare for AWS Cloud Practitioner certification (CLF-C02) — it validates foundational cloud knowledge and is the first step in the AWS certification path.

Practice with AWS hands-on labs. Set billing alerts (CloudWatch → Billing → Create Alarm) to avoid unexpected charges. Always terminate resources you're not using.