freeCodeCamp.org

Go is a fast language that is often used for backend, cloud, and server-side development. In this tutorial, @njong_emy teaches you how to install Go, write your first program, and understand how packages and the main function work. You'll also learn Go basics like variables, string formatting, arrays, slices, loops, functions, maps, and structs. freecodecamp.org/news/how-to-ge…

Most web app vulnerabilities come from ordinary code patterns that trust the wrong data. In this guide, Canio shows how to fix common Node.js security issues with real Express examples. You'll learn how to prevent mass assignment, prototype pollution, race conditions, business logic flaws, and JWT misconfiguration. freecodecamp.org/news/how-to-fi…

Finding the shortest path sounds simple until you have many routes, weights, and possible paths to compare. In this video essay, @EstefaniaCassN explains how Dijkstra's Algorithm works. You'll learn about graphs, nodes, edges, weights, greedy selection, adjacency lists, and how to rebuild the final shortest path in Python. freecodecamp.org/news/understan…

React Native lets you build mobile apps for iOS and Android, but full-stack apps also need auth, data, styling, and so on. In this course, you'll build a complete grocery list app with React Native and Expo. You'll use Neon Postgres, Drizzle ORM, Clerk auth, and other popular tools, and by the end you'll have a production-style app. freecodecamp.org/news/master-fu…

For today's coding challenge, given a number of six-sided dice to roll and a target sum, return the odds of rolling that sum as a string in the format "1 in X". See if you can solve it on the freeCodeCamp mobile app.

Shaders can make visuals run fast because they use the GPU instead of drawing everything on the CPU. In this course, Patt teaches you shader programming for beginners with JavaScript and p5.js. You'll learn about WebGL, coordinate spaces, shaping functions, animation, and more, plus how to build a glowing fractal heart from scratch. freecodecamp.org/news/intro-to-…

Learning to code can feel overwhelming when you don't know where to start. So here's a course for you: Sunny teaches you Python from the ground up. You'll install Python, write your first program, learn variables, strings, operators, conditionals, and loops, then build some small apps. freecodecamp.org/news/a-beginne…

You may have heard "It worked on my machine" recently and wondered "how can this still happen?" Well, it's because local, staging, and production environments rarely stay identical, which can create production-only bugs. In this article, @manishmshiva explains why environment drift still wastes engineering time and how managed platforms can help. freecodecamp.org/news/why-it-wo…

Modern image generators trace back to a simple idea: add noise to data, then learn how to reverse it. In this AI paper review, @programmingoce explains Deep Unsupervised Learning using Nonequilibrium Thermodynamics. You'll learn about forward diffusion, reverse denoising, and why this paper became the foundation for modern diffusion models. freecodecamp.org/news/ai-paper-…

An A/B test can tell you whether an AI feature moved a metric, but you still need to know by how much and how confident you should be. In this tutorial, Rudrendu shows you how to use regression-based causal inference for LLM product experiments. You'll learn about mean differences, robust standard errors, and bootstrap confidence intervals with Python and statsmodels. freecodecamp.org/news/regressio…

Long PDFs are hard to search, and pasting the whole document into a prompt breaks down fast. In this tutorial, @Zia_Ullah_Khan shows you how to build a RAG chatbot for your docs with Node.js, Google Gemini, and pgvector. You'll upload PDFs and the tool will chunk text, create embeddings, store vectors in Postgres, retrieve relevant sections, and generate solid answers. freecodecamp.org/news/how-to-bu…

Learn some Python this weekend. 🐍 On the house, as always.

For today's coding challenge, you'll get today's date and a birthday. Your task is to return the number of days until the person's next birthday. See if you can solve it on the freeCodeCamp mobile app.

AI coding agents can write code fast, but speed doesn't matter if nobody trusts the output. In this article, @TechWithRJ2 explains how harness engineering helped make their internal documentation platform AI-native. You'll learn how type checks, test coverage, end-to-end tests, MCP tools, and more can make agent work safer and more useful. freecodecamp.org/news/harness-e…

Node.js apps often break in production because the server environment doesn't match your local setup. In this tutorial, Zia shows how to containerize a Node.js API with Docker and deploy it with GitHub Actions. You'll use Docker, Docker Compose, PostgreSQL, Docker Hub, and a CI/CD pipeline that runs on every merge to main. freecodecamp.org/news/container…

One LLM prompt can get messy when it has to plan, write, and review all at once. In this tutorial, Darsh shows how to build your first multi-agent AI system in Python and LangGraph. You'll use Ollama, Qwen, focused agent prompts, shared state, nodes, and edges to build a local study guide generator. freecodecamp.org/news/how-to-bu…

Push notifications don't work great for status updates that change every few minutes. In this handbook, Farouq teaches you how to build persistent live update cards in React Native. You'll use TypeScript, Swift, Kotlin, and Android Live Updates to build a delivery-tracking demo that updates in place. freecodecamp.org/news/react-nat…

A Live Activity is a card that sits on your lock screen and updates without you having to open the app. And Apple and Android both support this - but it works really differently on each platform. In this handbook, @Fasthecr3ator helps you build both versions: a Swift one that talks to ActivityKit and a Kotlin one that talks to NotificationManager. freecodecamp.org/news/react-nat…

When a CEO buys shares after a big stock drop, it can look like a strong bullish signal. But beaten-down stocks often rebound even without insider buying. In this tutorial, Nikhil helps you build a Python workflow to match CEO purchases against similar no-purchase drawdowns for a fairer analysis. freecodecamp.org/news/how-to-an…

For today's coding challenge, you'll get a string and will need to convert it to Pig Latin using various rules. Check it out on the freeCodeCamp mobile app.