freeCodeCamp

How to Modernize a Legacy Application with AI Without Turning It Into a Rewrite

Hugo Teijiz |
I have seen legacy migrations considered successful because the old framework disappeared from the repository. Six months later, the team was still dealing with the same coupling, the same unclear bus... read more

How to Build Production-Grade Agents with Pydantic AI

Jay Mehta |
Building AI agents with raw LLM SDKs works fine for prototypes until you need structured outputs, testable code, and production reliability. The gap shows up in a predictable way. Your notebook code w... read more

How to Create a Scalable KYC Onboarding Flow in React with Shadcn UI

Vaibhav Gupta |
Every B2B SaaS product with a compliance requirement (like banking, lending, payroll, or crypto) hits the same wall early on: before you can let a business use your platform, you need to verify who th... read more

How the Chrome Dino Game Works Under the Hood: A Tour of Chromium's Source Code

Alex Oliinyk |
You've seen it a hundred times: the Wi-Fi drops, Chrome shrugs, and a little pixelated T-Rex appears, ready to sprint through a desert the moment you hit the spacebar. That tiny game, hidden behind th... read more

How to Build a Production-Ready AI Agent for $0/Month Using PHP, cPanel, and Gemini Flash

Chidozie Managwu |
In this tutorial, you’ll build a practical AI agent that can receive a user prompt, decide whether it needs to use a tool, execute that tool in PHP, store conversation history in MySQL, and continue r... read more

Python for Mechanical Engineering

Beau Carnes |
Whether you're designing robotics, analyzing fluid dynamics (CFD), or working through complex engineering data, learning to code is one of the most effective ways to boost your workflow and technical... read more

Master Low-Level Graphics in C: Build a Software Renderer from Scratch

Beau Carnes |
When learning C, it's easy to get stuck building text-based terminal applications that simply ask for user input and print a result back out. While those are great for learning the basics of the langu... read more

How to Build a Browser-Based PDF Color Overlay Tool Using JavaScript

Bhavin Sheth |
Sometimes you don't want to change the actual content of a PDF. You simply want to add a colored layer over part or all of the document. This can be useful for creating branded reports, adding colored... read more

AI Paper Review: Generative Modeling by Estimating Gradients of the Data Distribution

Mohammed Fahd Abrah |
Today, diffusion models have become one of the most influential families of generative AI systems. They power applications ranging from image synthesis and editing to video generation, scientific disc... read more

How to Build an AI Agent with Per-User OAuth Access [Full Handbook]

Saif Ali Shaik |
When your AI agent serves more than one person, every tool call must answer: who's the agent acting for? Let's learn how to solve this by building an AI agent that connects with Slack and GitHub. A Sl... read more