freeCodeCamp.org

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…

If you've worked with big data or analytics platforms, you've likely heard of the ORC file format. To help you understand it better - and how to work with ORC in Python - @balawc27 wrote this guide. She teaches you how to read these files, write them with compression, work with complex data types, and more. freecodecamp.org/news/how-to-wo…

A/B testing breaks down when AI features roll out gradually instead of randomly. In this article, Rudrendu explains how regression discontinuity design helps estimate causal impact by comparing users near rollout thresholds. You’ll learn a practical experimentation method for GenAI product launches and staged deployments. freecodecamp.org/news/gen-ai-pr…

A complete SaaS payment flow involves much more than just charging a card. To help you build one, in this guide Magnus shows how to connect Stripe Checkout, webhooks, and transactional emails. You’ll learn how to handle successful payments, async events, and automated user communication. freecodecamp.org/news/saas-paym…

For today's coding challenge, you'll get a string and you'll need to determine if it's a valid ISBN-13 number. Check it out on the freeCodeCamp mobile app.

You don't need to rely entirely on hosted AI APIs anymore thanks to some solid open source options. In this course, @andrewbrown shows how to run open-source LLMs both locally and in the cloud. You’ll learn about model setup, inference options, hardware tradeoffs, and scaling strategies along the way. freecodecamp.org/news/how-to-ru…

Build systems can get pretty complicated pretty fast as projects grow. In this handbook, Nikheel teaches you how to use SCons to manage builds with Python-based config instead of complex Makefiles. You’ll learn about dependency tracking, custom build logic, cross-platform project setup, and lots more. freecodecamp.org/news/how-to-us…

Terraform state locking is critical when you have multiple devs deploying infrastructure. And in this guide, @tolani_akintayo helps you migrate from DynamoDB-based locking to the newer S3 native state locking workflow. You’ll learn how locking works, how to migrate safely, and how to avoid state corruption. freecodecamp.org/news/how-to-mi…