Free interactive courses
Learn to code with free interactive courses
Pick a programming language and start writing real code in your browser. Hands-on lessons, AI-assisted hints, and a free certificate at the end — no install, no signup wall.
18 languages·Free certificate
Browse all programming languages
Pick a language to start a free, interactive course. Each one has hands-on lessons, AI hints, and a free certificate when you finish.
HTML & CSSLearn HTML free with interactive lessons, real coding exercises, AI hints, and a certificate. HTML basics, tags, forms — runs in your browser, no install.JavaScriptLearn JavaScript free with interactive lessons, AI hints, and a certificate. JS basics, ES6, DOM and projects — runs in your browser, no install required.PythonLearn Python free with interactive lessons, AI hints, and a certificate. Start with Python basics, build real projects, no install — runs in your browser.C++Learn C++ Free with interactive lessons, AI hints, and a certificate. C++ basics, real projects — runs in your browser.CLearn C programming free with interactive lessons, AI hints, and a certificate. C basics, pointers, memory — runs in your browser, no install.SQLLearn SQL Free with interactive lessons, AI hints, and a certificate. SQL basics, real projects — runs in your browser.C#Learn C# online with interactive lessons, real exercises, AI hints, and a free certificate. C# basics, OOP, classes — runs in your browser, no install.JavaLearn Java free with interactive lessons, real coding exercises, AI hints, and a certificate. Syntax, OOP, projects — in your browser, no install.GOLearn Go programming free with interactive lessons, AI hints, and a certificate. Go basics, goroutines, channels — runs in your browser, no install.PHPLearn PHP online with interactive lessons, real exercises, AI hints, and a free certificate. PHP basics, web dev, projects — runs in your browser.RLearn R programming free with interactive lessons, real R exercises, AI hints, and a certificate. R basics, data analysis — no install, runs in browser.DartLearn Dart programming free with interactive lessons, AI hints, and a certificate. Dart basics, async, OOP — runs in your browser, no install required.RustLearn Rust programming free with interactive lessons, AI hints, and a certificate. Rust basics, ownership, borrowing — in your browser, no install.LuaLearn Lua programming free with interactive lessons, AI hints, and a certificate. Lua basics, scripting, Roblox-ready — runs in your browser, no install.RubyLearn Ruby programming free with interactive lessons, AI hints, and a certificate. Ruby basics, blocks, OOP — runs in your browser, no install.SwiftLearn Swift programming free with interactive lessons, AI hints, and a certificate. Swift basics, optionals, classes — runs in your browser, no install.AI PromptsLearn prompt engineering free with interactive lessons, real prompt examples, and a certificate. AI prompts for ChatGPT, Claude, and LLMs in your browser.TerminalLearn the Linux terminal and command line free with interactive lessons, real shell exercises, and a certificate. Bash, files, pipes — in your browser.
How it works
Three steps from your first line of code to a certificate you can show off.
- 01
Pick a language
Choose any of our supported programming languages — Python, JavaScript, Java, C++, SQL, and more. No card, no signup wall.
- 02
Learn by writing real code
Every lesson runs in your browser. Type real code, hit run, and see the output. AI hints help when you get stuck.
- 03
Earn a free certificate
Finish the course to unlock a verifiable certificate with a unique ID. Share it on LinkedIn, your CV, or your portfolio.
Frequently asked questions
Which programming language should I learn first?
It depends on your goal. Python is the easiest entry point and great for data, automation, and AI. JavaScript is the language of the web. Java and C# are strong choices for enterprise and Android. C++ is the standard for performance-critical work. If you have no specific target, start with Python — it's the gentlest ramp from zero to writing real code.
Are these courses really free?
Yes. Every course on Coddy is free — interactive lessons, coding exercises, AI hints, and the certificate at the end. There is no paywall to start, no signup wall to read content, and no card required to earn the certificate.
Do I need to install anything to take these courses?
No. Every exercise compiles and runs in your browser — Python, JavaScript, Java, C++, SQL, and the rest. There is no IDE to set up, no compiler to install, no project to configure. Open the lesson and start coding.
How long does it take to complete a course?
Most learners finish a language in 4–8 weeks of daily practice (around 30 minutes a day). The exact length depends on the language and your starting point. Coddy is designed for short, frequent sessions, so you can fit it around school or work.
Do I get a certificate at the end?
Yes — every course awards a free certificate when you finish. Each certificate has a unique ID and public verification URL, so recruiters and employers can confirm it is genuine. Add it to LinkedIn, your CV, or your portfolio.
Can I take multiple courses at once?
You can. Many learners pair a primary language (like Python or Java) with a complementary one (like SQL for data work, or JavaScript for the web). Your progress is tracked separately for each course.
