freeCodeCamp

How to Build an AI Chat App Interface With the Vercel AI SDK and Shadcn/ui

Vaibhav Gupta |
Every other AI product you open today has the same screen: a message list, a text box at the bottom, and words that stream in one token at a time. It looks simple, but it's not simple to build well. Y... read more

How to Build a Self-Evaluating AI System: Automated Testing and Evaluation Pipelines for LLM Applications

Jude Otine |
So you shipped your AI feature and it works in demos. Your team is impressed. Then a user asks a question slightly outside your test cases and the model confidently returns something completely wrong.... read more

How AI Is Changing Malware Detection: From Traditional Antivirus to Next-Gen Protection

Manish Shivanandhan |
Malware used to be simple to describe. A virus attached itself to a file, and antivirus software removed it. That world is gone. Today, a single attack can steal your passwords, lock up your photos, w... read more

Apple Watch Can Now Estimate Your Health Age, But What's It Actually Measuring? 

Shradha Puri |
Your birthday tells you how many years you've been alive. But it doesn't necessarily tell you how your body is aging. Two people can be the same age and still have very different levels of cardiovascu... read more

How to Implement LEGO Architecture in Flutter [Full Handbook]

Atuoha Anthony |
Almost everyone has snapped two LEGO bricks together at some point, even without owning a single set as an adult. You press one brick down onto another, feel it click, and it holds. You likely never o... read more

What Is an Agent Harness? The Architecture Behind Claude Code, DeepSeek Harness, and Hermes Agent

Rudrendu Paul |
On August 13, 2026, DeepSeek published a GitHub repository called deepseek-harness. Within two days, it had passed 95,386 stars and 8,826 forks (a vanity metric on its own, but a spike this fast signa... read more

How to Use Lovable Responsibly

Eva J Patel |
Building an app used to feel like assembling furniture without instructions, while missing half the screws. Today, AI-powered tools such as Lovable can help you turn an idea into a working web applica... read more

OpenAI Codex Crash Course

Beau Carnes |
OpenAI Codex is a very helpful tool in modern software development, but getting real value from it comes down to understanding how it is actually meant to be used. To help developers master its core c... read more

How Linux Actually Boots: From Firmware to the Login Screen

Chris Roy |
Open a terminal on any systemd machine and run this: systemd-analyze On the laptop I'm writing this on, it says: Startup finished in 5.855s (firmware) + 8.469s (loader) + 3.106s (kernel) + 12.181s (u... read more

What a Machine Learning Model is and How to Make One

Eva J Patel |
Machine learning can sound much more complicated than it actually is. You hear words like models, training, features, datasets, predictions, and algorithms, and it can feel like you need a PhD in math... read more