The Internet roadmap

Every Internet lesson we teach, laid out as one path. Each station is a stage; tap any lesson to open it. Stations turn teal as you finish them.

Legend:Lesson stageStage completeTap a lesson to open it

Internet & Networking Foundations

The Internet

Packets & Routing

TCP/IP Suite

IP Addresses

Domain Names

DNS Resolution Process

The HTTP Protocol

Client-Server Architecture

HTTP Request Anatomy

HTTP Response Anatomy

HTTP Methods

HTTP Status Codes

HTTP Headers

HTTPS & TLS

APIs, REST & Security

What is an API?

RESTful Principles

Idempotency

Same-Origin Policy (SOP)

CORS

Preflight Requests

Web Hosting & Delivery

Web Hosting Concepts

Web Servers vs App Servers

Content Delivery Networks (CDNs)

Edge Caching

The Critical Rendering Path

The Parsing Phase

DOM Construction

CSSOM Construction

Render Tree Compilation

The Layout Phase (Reflow)

The Paint Phase

The Compositing Phase

Rendering Performance

Render-Blocking Resources

Script Loading Strategies

Layout Thrashing (Reflow Triggers)

Repaint Triggers

Hardware Acceleration