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

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

Machine Learning and Artificial Intelligence are hot topics right now. And this course will give you a solid foundation in ML & AI skills. You'll learn key concepts like overfitting & regularization, common algorithms, & you'll build some projects, too. https://t.co/knw1w45Z2j

LLMs are limited by their training data – so if you want real-time info, you need RAG. Using Retrieval-Augmented Generation gives your models access to all sorts of helpful data. In this course, @ania_kubow helps you build your own RAG chatbot with JS. https://t.co/XcV4eZ7WVP

If your website takes too long to load, there's a good chance people will abandon it. So to help you make it snappier, Alex wrote this guide. He discusses various techniques like optimizing code & images and managing plugins & scripts to help you remove those extra bits and

For today's coding challenge, you'll get an array of values. You'll need to remove all occurrences of the most frequently occurring value and return the resulting array. Check it out on the freeCodeCamp mobile app.