freeCodeCamp.org

Software used to just follow instructions. But now it's starting to learn how to pursue goals. Here, @manishmshiva explains how AI agents use reasoning, memory, and tools to plan and execute tasks dynamically. You’ll also learn how agents differ from traditional software and why they're reshaping system design. freecodecamp.org/news/the-rise-…

Adding AI to an app is pretty straightforward. But building reliable AI systems is much harder. In this handbook, @atuohaa shows you how to create production-ready AI features in Flutter. You’ll learn about streaming, error handling, prompt design, state management, embeddings, and lots more. freecodecamp.org/news/how-to-bu…

Global AI rollouts can be hard to measure with traditional A/B testing. So here, Rudrendu explains how to use synthetic control methods in Python to estimate the causal impact of LLM features across regions and markets. You’ll also learn how to build comparison baselines when randomized experiments are not possible. freecodecamp.org/news/product-e…

For today's coding challenge, you'll get an array of integers that's sorted in ascending order - except for one out-of-place element. You'll need to return the index of that element. Check it out on the freeCodeCamp mobile app.

Building Chrome extensions is easier when the tooling can handle the boilerplate. In this handbook, @Preston_Mayieka teaches you how to develop extensions with Plasmo using React and TypeScript. You’ll also create content scripts, background services, and production-ready extension architecture. freecodecamp.org/news/how-to-de…

AI agents typically fail because the architecture is unclear, not because the model is weak. In this handbook, Tiago teaches you how to build agents with reliable planning, memory, tool use, and bounded execution loops. Along the way you’ll learn practical patterns for creating agents that stay stable in production. freecodecamp.org/news/how-to-bu…

You can turn PDF pages into images right in the browser - and this tutorial shows you how. @allinonetools walks you through building a PDF-to-image converter with JavaScript and PDF.js, no backend required. You’ll render pages to canvas, export them as images, and process files locally for better privacy. freecodecamp.org/news/pdf-to-im…

GPT-2 changed AI research by showing that scale alone can unlock new capabilities. In this paper review, @programmingoce explains how unsupervised next-token prediction led to translation, summarization, and question answering behaviors. You'll learn about transformers, zero-shot learning, and why GPT-2 mattered historically. freecodecamp.org/news/ai-paper-…

Ever noticed how a “simple deploy” can quickly turn into DNS, SSL, CI/CD, logging, and scaling work? Here, @manishmshiva explains how infrastructure complexity grows around even small applications over time. You’ll also learn how PaaS tools can help, and when to use them (plus when they're not the best fit). freecodecamp.org/news/why-your-…

WhatsApp automation gets more flexible when you self-host the stack. In this guide, Achiya shows you how to use n8n and WAHA to build bots that respond to messages, trigger workflows, and more. He covers setup, APIs, automation logic, and deployment workflows along the way. freecodecamp.org/news/how-to-bu…

For today's coding challenge, you'll get a string, and you'll need to return an object (JS) or a dictionary (Python) mapping each character to the number of times it appears. See if you can solve it on the freeCodeCamp mobile app.

Sometimes you may need to turn multiple images into a single PDF. And in this tutorial, @allinonetools shows you how to build a browser-based image-to-PDF converter using JavaScript and pdf-lib. You’ll import images, generate pages dynamically, and download the final PDF instantly. freecodecamp.org/news/how-to-co…

Good web design really starts with understanding how people think and behave. In this handbook, Ujah applies academic theories like cognitive load, Gestalt principles, and mental models to real web design decisions. You’ll learn how psychology and UX research can help you shape more intuitive interfaces. freecodecamp.org/news/how-to-ap…

Many cloud providers block outbound SMTP to reduce spam abuse - but what if you legit need to send emails? Well, in this guide @Derekvibe26 teaches you how to bypass those restrictions by sending email through Brevo’s HTTP API. You’ll learn about API-based delivery, authentication, and more reliable email workflows along the way. freecodecamp.org/news/how-to-by…

CLI tools are one of the fastest ways to automate developer workflows. And in this in-depth tutorial, @devseyi teaches you how to build, package, and publish command-line tools with Dart. You’ll learn about argument parsing, file handling, terminal UX, + how to publish your tool so others can use it, too. freecodecamp.org/news/learn-com…

If you're training an AI model, you'll typically need a robust GPU to power all those calculations. But how do you choose the right one? Should you rent or buy? In this guide, @adeboyedn helps answer these questions by explaining what specs really matter, how to analyze your workloads, and more. freecodecamp.org/news/how-to-ch…

For today's coding challenge, you'll get an array of objects, each with a "name" and "age" property. You'll need to return an array with the name of the oldest person. Check it out on the freeCodeCamp mobile app.

Blue-green deployments can help developers have zero-downtime releases and instant rollbacks for their software. And while the concept seems simple, things get more complex with databases and stateful services. In this guide, @caesar_sage teaches you how to manage blue-green deployments on AWS ECS with database migrations. freecodecamp.org/news/how-to-ma…

Building a payroll system is a great way to practice real-world backend development skills. Payroll systems are crucial - and you don't want servers getting blocking errors or timing out. In this in-depth guide, @webmekanic_ walks you through building a payroll system with Express and Monnify using background jobs. freecodecamp.org/news/build-a-p…

Tailwind CSS is a utility-first CSS framework that helps you build fast, scalable, and customizable UIs. And you can use the tailwind-sidebar NPM package right alongside it to simplify your app's sidebars. In this guide, Hitesh shows you how it works in a React + Next.js app so you can start using it in your projects. freecodecamp.org/news/how-to-us…