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.
3,300+ codders enrolled
89 lessons78 challenges164 quiz questions
- Beginner friendly
AI-assisted coding help
Hands-on interactive lessons
Audio narration on every lesson
Quizzes to test your knowledge
Free certificate of completion
Syllabus
Section 1
Fundamentals
Start sectionStartLearn to build user interfaces with React: components, JSX, props, state and events, from your first component to a working mini app.Meet React
5 lessons513JSX Expressions
5 lessons58Components
5 lessons48Props
6 lessons510State & Events
6 lessons59Forms & Inputs
5 lessons47Conditions & Lists
6 lessons510Project: Profile Card
4 lessons4Section 2
Next.js EssentialsDedicated page
Start sectionStartGo 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.Why Next.js
4 lessons39Routing & Links
6 lessons516Layouts & Metadata
6 lessons515Server & Client
6 lessons515Data on the Server
6 lessons516Server Actions
5 lessons413Client Navigation
5 lessons515Project: Coddy Eats
9 lessons9
Learn by Doing
Write real code, query databases, build websites, and master AI prompts. Our interactive lessons cover every skill modern developers need.
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January 2026
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Double or Nothing
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Code Anywhere
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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Compete on global leaderboards, invite friends to earn rewards, and celebrate each other's wins. Coding is better with friends!
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Promotion zoneEvery 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.
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.
Earn a Certificate
Earn certificates for every course you complete. Add them to your LinkedIn profile and resume to showcase your coding expertise to employers.
Certificate of CompletionPython Fundamentals
Add to LinkedInWhy 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.
