freeCodeCamp.org

If you want to improve your C++ skills, here's a course for you. You'll code in C++ and use the open-source JUCE framework to build an audio plugin. You'll gain a solid grasp of digital signal processing concepts, create a responsive GUI for your plugin, & more.
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If you want to run an LLM, you don't have to rely on cloud-based APIs anymore - you can do it right on your local machine. And here, Chaitanya helps you build your own local AI agent. You'll use the Qwen 3 family of LLMs + Ollama to simplify running LLMs locally.
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If you want to stay up to date on the latest AI & Machine Learning research, reading academic papers can help. But they can be a bit intimidating & hard to understand. In this course, you'll learn how to approach and understand their theory, math, and structure.
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In this episode of the podcast, Quincy talks with Carl Brown, a 37-year veteran of the tech industry. He's worked at many companies and knows what matters in quality software. They talk about AI hype, ageism, & how testing is a valuable skills for a dev.

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For today's coding challenge, you'll get a string and you'll need to return the sum of its letters based on some rules. Check it out on the freeCodeCamp mobile app.

Insecure Direct Object Reference (IDOR) is a vulnerability that lets attackers access data they shouldn't by guessing IDs. It's a common bug & is in the OWASP API Security Top 10. Here, Ayodele goes over real examples of how to keep user data secure in Next.js.

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Teaching code is difficult. Blogs and videos don't always let learners see how code & logic evolves over time. In this post, Mark introduces Storyteller, a VS code extension that plays back code evolution with inline comments so learners can follow step-by-step.

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Kubernetes is an open source tool that helps you manage all the parts of your apps in containers. In this handbook, Prince teaches you how to use K8s to wrangle everything & covers pods, workflows, deployments, creating clusters, use cases, & lots more.
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Design patterns are solutions to common coding problems that show up often in your projects. And here, Mark explains how some key object-oriented design patterns work in Java. He covers patterns like Strategy, Singleton, Composite, Decorator, Observer, & more.
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Flutter and Firebase work well together - and in this handbook, Anthony shows you exactly how. You'll learn how to integrate tons of different Firebase services into your Flutter apps + using Cloud Firestore and Functions, hosting and deploying your app, & more.
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When you're hacking away on your own projects, sometimes you want to put together your own tool stack. And here, Manish shares his picks for the ultimate Indie Hacker stack. He talks about key build tools, hosting & payment options, how to deploy, and more.
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For today's coding challenge, you'll get an array and you'll need to determine if it's flat or not. Check it out on the freeCodeCamp mobile app.

Telehealth lets patiences get certain health care remotely without going to a doctor's office. And it's helpful for devs to know how to build Telehealth apps. In this in-depth guide, Derek walks you through building one using the Stream Video & Chat SDK in React.
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SonarQube is an open source tool that helps you analyze your code to find any bugs and vulnerabilities. And here, Divya explains how you can use it. She walks you through what SonarQube does, helps you install & set it up, and runs through a quick code analysis.
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React lets you create interactive, reusable components that manage their own state and respond efficiently to data changes. And here, Mark covers React basics to get you started. You'll learn about writing components, building a React app with Vite, & more.
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Web scraping lets you gather info you may need from a webpage. And in this tutorial, Mihail shows you how to build your own scraper tool in React. You'll even make the app more performant by using local storage to store already scraped data.
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AI Engineers design, build, & deploy AI models & systems to solve complex real-world problems. If you want to get into the field, this handbook is for you. Tatev discusses must-have skills, shares tips for getting started, & goes through use cases for AI tools.
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If you're an aspiring Data Scientist, Data Science competitions can help improve your skills. And this course teaches you about Kaggle, a popular competition platform & DS community. It covers picking competitions, feature engineering, selecting a model, & more.
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For today's coding challenge, you'll get a string of sentences that don't have periods separating them. Your task is to add periods in the right places. Check it out on the freeCodeCamp mobile app.

Potential employers may want to know that you have solid Kubernetes skills. To show them, you can earn the Certified Kubernetes Administrator cert - and this course helps you study. Beau covers cluster architecture, workloads and scheduling, networking, and more.
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You may have tons of assets in your Flutter projects - like images, icons, & fonts. Managing them can be a pain, especially as your app grows - and if you're doing it manually. Here, Anthony shows you how to use the flutter_gen package to handle it more easily.
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Performance testing shows how your app will perform under real-world pressure. And here, Noor helps you build an end-to-end performance test in Apache JMeter. Your test suite will be dynamic & one-click executable, + you'll learn how to analyze the results, too.
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You may have heard about the Model Context Protocol and wondered how it lets AI tools connect to other tools, APIs, & systems. Well, it's all thanks to MCP servers. Here, Manish explains how MCP servers work & helps you build your own with Python + FastMCP.
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Building software with AI is not all about prompting. Adding rule-based checks and tests makes results safer and more reliable. In this in-depth tutorial, Sumit teaches you how to use a practical coding loop technique to get better results from AI.
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Proper documentation makes your REST API usable. Without proper docs, other devs won't know how to work with your API. Here, Orim shows you how to generate an OpenAPI specification and use Scalar to serve them from your Node.js app.
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For today's coding challenge, you'll get a matrix - which is an array of arrays. You'll also get an integer, and your task is to shift all values in the matrix by the given amount. Check it out on the freeCodeCamp mobile app.

Getting a web dev job today is more competitive than ever. You need more than just a portfolio to land a job. Here, Ilyas goes over strategy, skills prep, applications, interviews, and more so you make smarter decisions while looking for your next role.
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Learning Kubernetes doesn't come from memorizing commands. It comes when you start building like a platform engineer. In this course, you'll learn everything from core concepts to advanced industry standards like using Prometheus & Grafana for observability.
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The future of software is code that reasons. And Python is your first step. In this video course, you'll learn Python fundamentals, NumPy, Pandas, SQL, Flask, LLMs, and everything else you need to dive into AI Agent development.
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No one wants to be placed on a Performance Improvement Plan. Moshe certainly didn't - until he dug in, worked harder, & started improving. Here, he discusses his PIP experience at Google - what he learned, where he is now, & how to not let a PIP get you down.
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