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Learn Luau

A free, interactive Luau course - the gradually typed Lua dialect created at Roblox and used by every Roblox game. You write real Luau on every lesson: type annotations, typed tables, unions, literal types, generics, strict mode - with AI hints when a type error stops you and a certificate when you finish. It's the fourth section of the Lua journey, so the Lua foundations that Luau builds on are one click away.

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View syllabusIntroduction To Luau playground

68,940+ codders enrolled

73 lessons57 challenges420 quiz questions

  • Beginner friendly
  • sparkles iconAI-assisted coding help
  • hint iconHands-on interactive lessons
  • volume On iconAudio narration on every lesson
  • quiz iconQuizzes to test your knowledge
  • certificate iconFree certificate of completion

Syllabus

1 sections2 projects73 lessons57 challenges420 quiz questions

This section is part of the Lua Journey. The full syllabus has more sections - click any preview below to view it on the Journey page.

  1. Section 1Fundamentals90 lessons
  2. Section 2Logic & Flow54 lessons
  3. Section 3Object Oriented Programming70 lessons
  4. Section 4

    Introduction To Luau

    Start sectionStartExpandCollapse    Take your Lua skills further with Luau - Lua with a gradual type system. Learn type annotations, typed tables, unions, generics and more, and catch bugs before your code even runs.73 lessons57 challenges420 questions2 projects

    Getting Started with Luau

    5 lessons232

    Core Types

    7 lessons748

    Typed Tables: Arrays & Maps

    9 lessons863

    Working with Functions

    8 lessons856

    Aliases, Unions, Intersections

    7 lessons748

    Typing Table Shapes

    8 lessons755

    Project: Typed Task Manager

    Project6 lessons1

    Enums, the Luau Way

    6 lessons539

    Generics: A First Look

    6 lessons539

    Project: Generic Inventory

    Project5 lessons1

    Advanced Topics

    6 lessons640
View the full Lua Journey syllabus
What you get
Everything you'll use to learn to code

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playground.js
Code Editor
1const greeting = "Hello, Coddy!"
2function sayHi(name) {
3    return greeting + " " + name
4}
5
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Input
"Alex"
Output
"Hello, Coddy! Alex"

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Take your coding journey on the go! No setup, no downloads - just open and start coding. Available on iOS, Android and Web with 4.9 star ratings.

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Variables
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Every way to learn

Read, listen, test yourself, ask the AI, or look up anything you've already covered. Every lesson meets you where you are.

Intro to Variables
Audio

A variable is a named container that stores a value you can reference later in your program.

In Python, you create one by writing the name, an equals sign, then the value you want to store.

The value can change over time - reassigning the name simply points it to a new value.

1xSarah

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Earn certificates for every course you complete. Add them to your LinkedIn profile and resume to showcase your coding expertise to employers.

CoddyCertificate of Completion
This certifies thatJohn Doehas successfully completed
PythonPython Fundamentals
Verified
DateJan 2026
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Why learn Luau with Coddy

  • Run Luau in your browser. No Roblox Studio, no local build of the luau CLI, no editor plugin - write typed code and see both the output and the type errors instantly.
  • The type system, in small steps: annotations, any/unknown/never, optional types with ?, typed arrays and maps, function types, type aliases, unions and intersections, literal types, table shapes, enums, generics, and type guards.
  • Luau-only syntax you won't find in plain Lua: string interpolation with backticks, compound assignment (+=, ..=), continue, if ... then ... else expressions, generalized iteration, and table.freeze.
  • AI hints explain what a Luau type error is actually telling you without handing over the fix, so the next one is easier to read on your own.

Frequently asked questions about learning Luau

What is Luau?

Luau is a programming language derived from Lua 5.1, created and open-sourced by Roblox. It keeps Lua's syntax and speed but adds a gradual type system, so you can annotate as much or as little of your code as you like. It's the language every Roblox game is scripted in, and it's also used standalone as a fast, embeddable scripting language.

What is the difference between Lua and Luau?

Luau is a superset of Lua 5.1 with a few removals. The big addition is types: local hp: number = 100, type aliases, unions, generics, and three checking modes (--!nocheck, --!nonstrict, --!strict). Luau also adds string interpolation with backticks, compound assignment operators like += and ..=, continue, if ... then ... else expressions, floor division //, generalized iteration, and functions like table.freeze. For sandboxing it drops loadstring, loadfile and dofile. Ordinary Lua code generally runs unchanged as Luau.

Do I need to know Lua before learning Luau?

Yes - Luau is Lua with types on top, so tables, functions, metatables, and scoping are the same. That's why this section is the fourth part of the Lua journey: take the Fundamentals, Logic & Flow, and OOP sections first, or jump straight here if you're already comfortable with Lua.

Is Luau the same as Roblox scripting?

Luau is the language; Roblox scripting is the language plus the Roblox engine API (game, workspace, Instance.new, events, and services). This course teaches the language itself - the part that transfers to any Luau project and the part that trips people up when they start reading real Roblox code. Lessons run standalone Luau in the browser, so the Roblox engine API isn't available here; once the language clicks, the Roblox API is documentation you look up, not a language you relearn.

Is Luau's type system like TypeScript's?

The idea is the same - optional static types layered on a dynamic language, checked before your code runs - and many concepts carry over: unions, generics, literal types, narrowing. The syntax differs (local x: number, type Point = { x: number, y: number }, (number) -> string for function types) and Luau infers a lot without annotations. Coming from TypeScript, you'll be productive within a lesson or two.

Can I learn Luau online for free?

Yes. The whole Luau section is free - lessons, coding exercises, projects, quizzes, and the certificate. The luau runtime is built into the browser editor, so nothing to install and nothing to configure before your first typed function.
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