A Visual Refresher on AWS Cloud Fundamentals

Strengthening Cloud Fundamentals for the AI Era

Author

Senthil Kumar

Published

February 22, 2026

👈 Back to: 📝 Blog | 💼 LinkedIn | ✍️ Medium

A strong engineer becomes exponentially more effective with AI — but only if the fundamentals are solid.

Over the last four years, I’ve worked deeply in cloud engineering.
But I asked myself a hard question:

Do I truly understand the foundations — or just operate at the surface?

This book is my attempt to revisit AWS cloud fundamentals with:

Practical cloud engineering experience
Visual mental models

This book covers the following

flowchart LR
    A[Cloud Fundamentals]
    A --> B[Security]
    A --> C[Compute]
    A --> D[Networking]
    A --> E[Storage]
    A --> F[Databases]
    A --> G[Monitoring]
    A --> H[Optimization]

🧱 What This Book Covers

This is a structured, visual walkthrough of core cloud building blocks:

Foundations — Regions, Availability Zones, resiliency, shared responsibility
Security — IAM, policies, roles, and the root user
Compute — EC2, containers, serverless
Networking — VPC, subnets, routing, security boundaries
Storage — S3, EBS, instance store tradeoffs
Databases — RDS, DynamoDB, data architecture decisions
Monitoring — CloudWatch, scaling, load balancing
Optimization — Scaling, Performance tuning and cost optimization

Each section includes:

📊 Mermaid diagrams to visualize architecture
🧠 Conceptual breakdowns
🧪 AWS CLI examples (because every AWS activity is just an API call)
⚙️ Design thinking behind service choices

🧠 Why This Exists

AI can accelerate engineers. But AI cannot compensate for weak fundamentals.

The goal of this guide is simple:

Rebuild cloud fundamentals with clarity, structure, and visual intuition.

If you’re preparing for:

AWS certification
Cloud Architecture interviews
Or simply strengthening your cloud mental model

This book is meant to help, as it would help myself.

🌍 For Azure & GCP Engineers

If you’re working on Azure or GCP and find these visual models helpful,
feel free to adapt the diagrams and mental frameworks for your own cloud journey.

Completed this Course on Oct 15, 2024

📜 Source & Attribution

I have used a few screenshots from the AWS Technical Essentials course on Coursera and are used strictly for learning purposes.