Foundational Questions. Visual Answers. Mastering AWS Fundamentals.

Strengthening Cloud Fundamentals for the AI Era

Author

Senthil Kumar

Published

February 22, 2026

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

❓ 1. Why this Book

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

✍️ What motivated me to write this short visual guidebook on AWS Cloud Fundamentals📝:

👉🏻 This question 🙋🏻‍♂️: Do I really understand the fundamentals deeply, or have I just gotten comfortable operating around them?

👉🏻 This thought 💭:

❖ If someone is strong in the fundamentals, AI amplifies that skill to a 10X level.
❖ Sometimes going back to the fundamentals is the most advanced thing one can do.

What could motivate you to read this?

👉🏻 A visual guidebook to deeply understand (not just use) cloud concepts
👉🏻 A way to strengthen intuition so tools like AI become force multipliers

❓ 2. What this book covers

Section We will Cover

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]

This is a structured, visual walkthrough of core cloud building blocks — explored through the questions that matter.

Strong fundamentals aren’t memorized. They’re built by asking the right questions.

If questions like these spark your curiosity, you’re in the right place:

🌍 Foundations

1. Isn’t every AWS action just a chain of API calls?
2. Who is responsible for availability and durability—You or AWS?

🔐 Security

3. How is every AWS request authenticated and authorized?
4. Why do modern teams prefer IAM Roles over IAM Users?
5. How do humans vs applications securely access AWS? (IdP vs Cognito)

⚙️ Compute

6. When should you choose EC2, Containers, or Serverless?
(What really differentiates EC2, ECS/EKS, and Lambda?)

🌐 Networking

7. What actually happens inside a VPC when your app talks to the internet?

💾 Storage

8. How do you choose between S3, EBS, and EFS without guessing?

🗄️ Databases

9. When do you pick RDS vs DynamoDB—and why does it matter?

📊 Monitoring

10. How do you know what’s happening inside your cloud system (before users do)?

⚡ Optimization

11. How do you design for cost and performance without trade-offs?

📝 3. Learning Notes Inspired by the Coursera Course

I took the Cloud Fundamentals Coursera Course in in Oct, 2024 and revisited in early 2026 to write this book

📜 4. Source & Attribution

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