Architecture & Design
Start with OOP foundations, internalize SOLID with real conflicts, learn the design patterns you will actually use, then lock down the browser side with CORS, Same-Origin Policy, and CSP.
What you'll learn
Follow in order: each step builds on the previous one.
- 1
The Four Pillars of OOP Explained
Understanding Object-Oriented Programming through everyday examples.
- 3
OOP Design Patterns for Beginners
Master the most important design patterns with practical examples.
- 4
Understanding CORS in Web APIs
A clear and practical guide to CORS, origins, preflight requests, and real API security strategies.
- 5
CORS vs CSP vs Same-Origin Policy
A clear comparison of Same-Origin Policy, CORS, and Content Security Policy. Understand how these three browser security mechanisms work together and when to use each.
- 6
API Gateway for Beginners in .NET
Learn why microservices need an API Gateway and how to build one in .NET with Ocelot. Explore routing, environment configuration, JWT authentication, rate limiting, caching, health checks, IP whitelisting, circuit breakers, CORS, messaging, logging, metrics, deployment, and scaling.