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Free 10-lesson series

System Design for Beginners

Understand how modern applications handle more users, stay fast and recover from failure—one visual lesson at a time.

Lesson 1 is available now
Start with the foundations

Each lesson uses plain English, practical examples and original diagrams.

Lesson 01AvailableOne powerful server compared with a connected group of servers
Scaling

Vertical Scaling vs Horizontal Scaling

Compare bigger servers with more servers and learn why traffic often needs a load balancer.

· 14 min read

Read lesson
Lesson 02Coming soonRequests distributed through a load balancer to three servers
Traffic

How a Load Balancer Works

See how one entry point spreads requests across healthy application servers.

Planned lesson
Lesson 03Coming soonFast cache layer responding before a slower database path
Performance

Caching Explained Simply

Learn why keeping frequently used data nearby can make an application much faster.

Planned lesson

Complete learning roadmap

  1. Vertical vs horizontal scaling
  2. Load balancers
  3. Content delivery networks
  4. Rate limiting
  5. API gateways
  6. Microservices
  7. Message queues
  8. Publish/subscribe and fan-out
  9. Database scaling
  10. Caching

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