Sikau

47 courses · 608 hands-on lessons

Learn to code
by writing real code.

Short daily lessons where you build real things — websites, APIs, a programming language, an AI — right in your browser. Go from your first line of code to engineering at scale.

Start learning freeExplore courses
  • Free to learn
  • No installs
  • Works on your phone

One place for the whole stack

HTML, CSS, JavaScript, Advanced JavaScript, Git & GitHub, TypeScript, Web essentials, React, Next.js, Node.js, NestJS, Databases and SQL, PostgreSQL, MongoDB, Prisma, Linux and the shell, GitHub Actions, DevOps and deployment, Data structures, Algorithms, How computers work, Assembly language, Operating systems, Computer networks, WebAssembly, Security, System design, AWS, LLM engineering, Build an interpreter, Theory of computation, Artificial intelligence, Microsoft Azure, React patterns at scale, Python, Go

Why Sikau

The fastest way from reading about code to writing it

Every lesson ends with you running code, not watching someone else do it.

Real code, real feedback

Write JavaScript, TypeScript, Python, Go, SQL, React and shell commands. Every exercise is checked the moment you run it.

Nothing to install

Editors, databases, terminals and compilers all run in your browser — on a laptop or your phone.

Small steps that stick

Short explanations, then predict, order and match exercises that make you think before you type.

Reviews at the right time

Lessons come back for a quick review just as you're about to forget them, so ideas stay with you.

A habit, not a chore

Daily streaks, XP, levels and badges make it easy to come back tomorrow — even for ten minutes.

Certificates you can share

Finish a course to earn a certificate with a verified link that anyone can check.

Build real things

Projects worth putting in your portfolio

Each stage ends in a project that pulls everything together.

Build an interpreter

Your own programming language

A lexer, a Pratt parser and an evaluator — with closures and loops you add yourself.

A search engine

A search engine

Autocomplete, an inverted index, ranking and spelling correction.

Artificial intelligence

An unbeatable game player

Minimax with alpha-beta pruning, an 8-puzzle solver and a neuron that learns.

The café front end

A café's web app

A React front end that grows into a full Next.js app.

A secure API gateway

A secure API gateway

Networking, WebAssembly sandboxes and security working together.

Go

A concurrent log analyser

Goroutines, channels and table-driven tests in Go.

Learning paths

Follow a path, or jump in anywhere

Three paths take you stage by stage. Already know the basics? Open any course directly.

Full-stack web development

From your first HTML tag to apps with databases, servers and automated deployments — one step at a time.

  1. 1Foundations
  2. 2Programming
  3. 3Professional tools
  4. 4Frontend frameworks
  5. 5Backend
  6. 6Storing data
  7. 7Shipping to production
  • HTML
  • CSS
  • Project: Your first website
  • JavaScript
  • Advanced JavaScript
  • Project: A JavaScript app
  • Git & GitHub
  • TypeScript
  • Web essentials
  • Project: Team workflow
  • React
  • Next.js
  • React patterns at scale
  • Project: The café front end
  • Node.js
  • NestJS
  • Project: An orders API
  • Databases and SQL
  • PostgreSQL
  • MongoDB
  • Prisma
  • Project: The café’s data
  • Linux and the shell
  • GitHub Actions
  • DevOps and deployment
  • Project: Laptop to production

Computer engineering

Go under the hood: algorithms, the machine itself, operating systems, networks, the cloud and AI.

  1. 1Problem solving
  2. 2The machine
  3. 3Connected systems
  4. 4At scale
  5. 5AI engineering
  • Data structures
  • Algorithms
  • Project: A search engine
  • How computers work
  • Assembly language
  • Operating systems
  • Project: A whole computer
  • Computer networks
  • WebAssembly
  • Security
  • Project: A secure API gateway
  • System design
  • AWS
  • Microsoft Azure
  • Project: Ready for millions
  • LLM engineering

Computer science

How programming languages work, what computers can and can't compute, and how machines act intelligently.

  1. 1How languages work
  2. 2Limits of computing
  3. 3Intelligent agents
  • Build an interpreter
  • Python
  • Go
  • Theory of computation
  • Artificial intelligence

How it works

Ten minutes to start, a habit for life

  1. 1Sign in and pick a goalBuild websites, ship to production, ace interviews or invent a language — your first lesson opens right away.
  2. 2Learn in small stepsRead a little, predict what code does, then write it yourself with instant checks and hints.
  3. 3Come back tomorrowYour streak grows, earlier lessons return for a quick review, and badges mark every milestone.
  4. 4Finish and shareComplete a course to earn a verified certificate you can share with anyone.

Questions

Good to know

Is Sikau free?

Yes. Sign in with Google and every course, exercise and certificate is open to you.

Do I need any experience?

No. Start with HTML or JavaScript from zero. If you already code, jump straight into React, Go, AI or system design — every lesson can be opened when you're ready.

How much time does it take?

A lesson takes 20–40 minutes, in small steps you can pause at any point. Choose one or two a day, or go at your own pace.

Do I need to install anything?

No. Code runs right in the page: JavaScript, TypeScript, Python, Go, SQL databases, React, Git and a Linux shell.

Will my progress follow me?

Yes. Your lessons, streak, badges and code are saved to your account and sync to every device you sign in on.

Your first lesson is one click away

Join free, pick a goal, and write your first line of code today.

Start learning free