Menu
Coddy logo textTech
START LEARNING
flag En iconEnglishdown icon
NewJourney

Learn React - Free Interactive Course

Master React by writing real components from lesson one: JSX, props, state and events, then keep going into Next.js - file-system routing, layouts, server components, data fetching and server actions. Everything runs in your browser with AI hints when you get stuck, and you earn a free certificate when you finish.

START LEARNING(it's free)
View syllabus

1,000+ codders enrolled

89 lessons69 challenges164 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

2 sections1 projects89 lessons69 challenges164 quiz questions
  1. Section 1

    Fundamentals

    Start sectionStartExpandCollapse    Learn to build user interfaces with React: components, JSX, props, state and events, from your first component to a working mini app.42 lessons37 challenges65 questions

    Meet React

    5 lessons513

    JSX Expressions

    5 lessons58

    Components

    5 lessons48

    Props

    6 lessons510

    State & Events

    6 lessons59

    Forms & Inputs

    5 lessons47

    Conditions & Lists

    6 lessons510

    Project: Profile Card

    4 lessons4
  2. Section 2

    Next.js EssentialsDedicated page

    Start sectionStartExpandCollapse    Go from React components to a real app: file-system routing, layouts, server and client components, data fetching, server actions, and a complete Next.js project.47 lessons32 challenges99 questions1 project

    Why Next.js

    4 lessons39

    Routing & Links

    6 lessons516

    Layouts & Metadata

    6 lessons515

    Server & Client

    6 lessons515

    Data on the Server

    6 lessons516

    Server Actions

    5 lessons413

    Client Navigation

    5 lessons515

    Project: Coddy Eats

    Project9 lessons
What you get
Everything you'll use to learn to code

Learn by Doing

Write real code, query databases, build websites, and master AI prompts. Our interactive lessons cover every skill modern developers need.

playground.js
Code Editor
1const greeting = "Hello, Coddy!"
2function sayHi(name) {
3    return greeting + " " + name
4}
5
bottombar Collapse icon
Test #1test Case Success icon
Test #2test Case Success icon
Test #3test Case Failure icon
Input
"Alex"
Output
"Hello, Coddy! Alex"

Build Your Coding Streak

Stay consistent and watch your progress grow! Track your daily coding habit, protect your streak with freeze days, and earn rewards for showing up every day.

12 days streak

Return tomorrow to keep your streak!

fire Filled icon
left icon

January 2026

right icon

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

21

22

23

24

25

26

27

28

29

30

product Double Or Nothing icon

Double or Nothing

Day 5 of 7

fire Freeze icon

Streak Freeze

2 left

Code Anywhere, Anytime

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.

Python
7Streak
250Score
5Energy
Variables
journey Hex Done Base iconjourney Hex Done Shadow iconjourney Hex Done Top iconjourney Lesson Done icon
journey Path Right Done icon
journey Hex Done Base iconjourney Hex Done Shadow iconjourney Hex Done Top iconjourney Lesson Done icon
journey Path Left Done icon
journey Hex Active Base iconjourney Hex Active Shadow iconjourney Hex Active Top iconjourney Lesson Theory Challenge icon
CONTINUE
journey Path Right icon
journey Hex Locked Base iconjourney Hex Locked Shadow iconjourney Hex Locked Top iconjourney Lesson Theory Challenge icon
journey Path Left icon
journey Hex Locked Base iconjourney Hex Locked Shadow iconjourney Hex Locked Top iconjourney Lesson All icon
Journey
Goals
Leaderboard
Profile
4.9
StarStarStarStarStar
Rating

You're Not Alone in This

Compete on global leaderboards, invite friends to earn rewards, and celebrate each other's wins. Coding is better with friends!

Challenger League
Challenger LeagueTop 7 advance
leaderboard First icon1
avatar 1 icon
fire Filled icon
Alex7+ Days
2840
leaderboard Second icon2
avatar 2 icon
fire Filled icon
Jordan7+ Days
2650
leaderboard Third icon3
avatar 3 icon
fire Filled icon
Sam7+ Days
2420
4
avatar 4 icon
Casey
2180
5
avatar placeholder icon
fire Filled icon
Morgan7+ Days
1950
leaderboard Arrow Up iconPromotion zoneleaderboard Arrow Up icon

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

Prove Your Skills

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
LinkedInAdd to LinkedIn

Why learn React with Coddy

  • Write JSX in your browser from the first lesson. No Node install, no create-react-app, no build setup - every lesson gives you real component code to edit and run.
  • A curriculum that ends in real apps: components, props, state, events and hooks in the Fundamentals section, then a full Next.js section - routing, layouts, server and client components, data fetching and server actions.
  • AI hints that read your actual code. When a component won't render or state won't update, you get a nudge that points at your bug without spoiling the solution.
  • A free React certificate when you finish - a strong signal for frontend roles, where React remains the most in-demand UI library.

Frequently asked questions about learning React

What is React?

React is a JavaScript library for building user interfaces out of components - small, reusable functions that return markup. Created at Meta, it powers a huge share of the modern web, from Facebook and Instagram to millions of startups' products, and it's consistently the most in-demand frontend skill in job listings.

Do I need to know JavaScript before learning React?

You should be comfortable with JavaScript basics - variables, functions, arrays and objects. The course introduces the JavaScript patterns React leans on (arrow functions, destructuring, map) as they come up, so you don't need to be an expert. If you're brand new to code, take the JavaScript journey first.

Is React hard to learn?

The core ideas - components, JSX, props - click quickly because they map to things you already know: functions and HTML. State, effects and data flow take more practice, which is why every lesson here has you writing and running real component code instead of just reading about it.

What's the difference between React and Next.js?

React is the UI library - components, state, rendering. Next.js is a framework built on top of React that adds what real apps need: file-system routing, layouts, server-side rendering, data fetching and server actions. The course teaches React fundamentals first, then a dedicated Next.js section takes you from components to a complete app.

Can I learn React online for free?

Yes. The interactive React course is free: hands-on lessons, coding challenges with instant feedback, AI-assisted hints, and quizzes. Everything runs in your browser, so there's nothing to install and you can start immediately.

Do I get a certificate after the React course?

Yes. Finishing the course earns you a free certificate of completion you can add to LinkedIn or your resume. Paired with the components and apps you build along the way, it's meaningful proof of practical React and Next.js skills.
Coddy programming languages illustration

Learn React with Coddy

GET STARTED