When you run a single AI agent, debugging is straightforward. You read the log, you see what happened. When you run five agents in a swarm, each spawning its own tool calls and producing its own outpu

Every RAG system I've seen — including the one I wrote a handbook about on this site — has the same fundamental problem. It doesn't learn. You ingest 500 documents. You ask a question. The system retr

What if you could build your own LLM, one that speaks your native language, all from scratch? That's exactly what we'll do in this tutorial. The best way to understand how LLMs work is by actually bui

Working with PDFs is part of everyday development. Sometimes you don’t need the entire document. You just need a few pages — maybe a specific section, a report summary, or selected invoice pages. Most

If you've been storing AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY as GitHub Secrets to deploy to AWS, you're not alone. It's the most common approach and it's also one of the biggest security risks i

Secure software requires both design-time and code-time protection. STRIDE threat modeling helps identify risks early in system design, while SonarQube enforces secure coding practices through static

If you've ever wanted to add an interface to a codebase and gotten pushback, you already know the argument: "That's twice the code for the same thing." And honestly? It was a fair point. You'd write t

Most developers live in their terminal. You run commands, debug pipelines, manage infrastructure, and navigate codebases, all from a shell prompt. But despite how central the terminal is to developer

Can you achieve a massive milestone while you're still in high school other than just getting high grades? You may be thinking: school alone is plenty of work! And it often is. But if you set your min

Have you ever wondered how platforms like Webflow, Notion, or Hashnode serve thousands of users from a single codebase — each with their own unique URL? The answer is multi-tenancy: an architecture wh

I typically build my projects using Next.js 14 (App Router) and Supabase for authentication along with Postgres. The default deployment choice for a Next.js app is usually Vercel, and for good reason:

Most sites think they're getting AI citations because their brand shows up in ChatGPT answers, but they're not. Visibility and citation are different numbers, and the gap between them is where the lea

Imagine that you want to share your source code with someone who doesn’t have Go installed on their computer. Unfortunately, this person won’t be able to run your application. Even if they do have Go

Are you ready to be inspired by the next generation of tech innovators? freeCodeCamp.org just dropped a new documentary on our YouTube channel that dives deep into Stanford’s TreeHacks 2026, one of th

Ready to dive into IT but don’t know where to start? freeCodeCamp just dropped the Ultimate IT Fundamentals Bootcamp For Absolute Beginners course. This is a a brand new, full-length course created by

In today's digital world, spam is no longer just an annoyance - it's a growing security threat. To combat this, developers often turn to machine learning to build intelligent filters that can distingu

You've completed three AWS courses. You have notes from a dozen Docker tutorials. You know what Kubernetes is, what CI/CD means, and you can explain Infrastructure as Code without hesitating. And yet

Building a single AI agent that answers questions or runs searches is a solved problem. A handful of tutorials and a few hours of work will get you there. What most tutorials skip is the engineering l

Every product experimentation team running causal inference on LLM-based features eventually hits the same wall: when users click "Try our AI assistant," the volunteers aren't a random sample. Your pr

Today Quincy Larson interviews Rachel An Fernandez. She's a computer science student at Stanford and the youngest instructor at the entire university. She recently helped organize TreeHacks, Stanford'