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.

BROWSE LANGUAGES

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.

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.