Smart home devices can be super helpful and convenient - but how do they actually work? Well, that's what Rez was wondering - so he decided to build his own, step by step. In this tutorial, he walks you through building a Smart HomeKit virtual light in Go to help you grasp the

Today I announce: you can now learn Mandarin Chinese on freeCodeCamp! 🀄️🐉 🈵 Learn beginner concepts: tones, pinyin, Chinese character stroke order, set phrases 🧑‍💼 Work as a dev alongside hand-drawn animated characters 💪 The first of A1 Level is live with more coming in 2026

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For today's coding challenge, you'll get a string that represents the subject line of an email. Your job is to determine how many times the email has been forwarded or replied to. Check it out on the freeCodeCamp mobile app.

The freeCodeCamp community just published our B1 English for Developers certification. So if you want to improve your English skills, this one's for you. You'll learn some more complex grammar, how to describe past experiences, comparative and conditional structures, and lots

Learning React can be tough - but building projects and solving coding challenges can help. And this hands-on course helps you do just that. In it, Bob walks you through 170+ coding challenges and 6 projects to teach you React fundamentals. https://t.co/EKvC0HM47k

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freeCodeCamp just released our new Relational Databases certification. So if you've been wanting to really dive into how databases work, this one's for you. You'll learn about code editors, bash scripting, SQL, Git, and more - with projects, review pages, and quizzes along the

freeCodeCamp just launched a FREE interactive curriculum where you can learn SQL + Relational Databases🧮 then earn a verified certification for LinkedIn. Check out all the topics this curriculum covers. You can work these in your local code editor, then take the final exam.

A database is one of the key parts of many software systems. And over time, database design has changed and evolved, from the early B-Tree structures to more modern LSM Tree options. In this handbook, Ramesh shows you how to build an LSM Tree storage engine from scratch to help

Tell your friends who are learning English: freeCodeCamp level B1 English for Developers is now live!🏕️ 💻 Work in tech. Talk with hand-drawn animated characters 🧑‍🔬 3,339 vocab + grammar lessons 🏄‍♀️ Neutral California accent 🏁 FREE verified certification after you pass

If you want to practice your full-stack development skills, this one's for you. In it, @dayvid_JS walks you through all the details of building a social learning platform. You'll use Next.js, Stream, and Supabase and set up real-time chat, a video conferencing feature, and

Hey everyone! 👋 As freeCodeCamp closes out the year, we're looking for feedback to help guide our community's direction for 2026. Let us know what you loved (and what we can fix) in this quick survey: https://t.co/yVigGGA7rZ Thank you! ❤️

For today's coding challenge, you get to go shopping (figuratively speaking, that is). You'll have an amount of money, and an array of items you want to buy - and you'll have to determine how many you can afford. Go solve it on the freeCodeCamp mobile app.

It's common to use single monolithic apps for frontend development. But there can be problems as projects grow. Here, @avmax19 dives into micro frontends, which break frontends into smaller apps for more flexibility. https://t.co/djnCESa1MQ

If you're curious about what it takes to build an AI agent, you'll learn how in this course. Lane teaches you how to use Python and the free Gemini API to code your own agent from scratch. You'll learn about the agentic loop, tool calling, and fixing buggy programs - and by the

AI tools are becoming more and more sophisticated - and as a dev, you can use them to become even more productive. And in this handbook, @raisedadead teaches you all about AI-assisted coding. He covers key tools to check out, using GitHub Copilot features, CLI-based agents like

If you want to start learning Mandarin Chinese, this course is for you. It teaches HSK Level 1, which certifies that you understand Mandarin basics. It covers Pinyin and tones, vocab and grammar, practical conversations you'd use in daily life, and more.

If you want to get into Machine Learning, a solid foundation in Linear Algebra is key. It'll help you understand how deep learning models, optimization algorithms, & computer vision work under the hood. In this course, you'll learn about matrices & vectors, determinants &

December 21st is the winter solstice for the northern hemisphere, and the summer solstice for the southern hemisphere. For today's coding challenge, you'll determine about how many daylight hours a particular location will have on the solstice. Check it out on the freeCodeCamp

If you want to become a great backend dev, you should build lots of projects. And there are 3 for you in this course: a blog generator, a Netflix clone, & a Spotify clone. You'll sharpen your backend skills using tools like Python, Django, & PostgreSQL. https://t.co/9ufIRCoTfp

LaTeX is a typesetting system you can use in technical, academic, & scientific writing. And you may have used website-based apps like Overleaf that let anyone read, write, & compile LatTeX-based scripts online. But here, @Fahim_FBA shows you how to run your LaTeX projects