[](https://codecrafters.io/github-banner) ## Table of Contents: Build your own X This repository is a compilation of well-written, step-by-step guides for re-creating our favorite technologies from scratch. > *What I cannot create, I do not understand — Richard Feynman.* It's a great way to learn. * [3D Renderer](#build-your-own-3d-renderer)* [Augmented Reality](#build-your-own-augmented-reality)* [BitTorrent Client](#build-your-own-bittorrent-client)* [Blockchain / Cryptocurrency](#build-your-own-blockchain--cryptocurrency)* [Bot](#build-your-own-bot)* [Command-Line Tool](#build-your-own-command-line-tool)* [Database](#build-your-own-database)* [Docker](#build-your-own-docker)* [Emulator / Virtual Machine](#build-your-own-emulator--virtual-machine)* [Front-end Framework / Library](#build-your-own-front-end-framework--library)* [Game](#build-your-own-game)* [Git](#build-your-own-git)* [Network Stack](#build-your-own-network-stack)* [Neural Network](#build-your-own-neural-network)* [Operating System](#build-your-own-operating-system)* [Physics Engine](#build-your-own-physics-engine)* [Programming Language](#build-your-own-programming-language)* [Regex Engine](#build-your-own-regex-engine)* [Search Engine](#build-your-own-search-engine)* [Shell](#build-your-own-shell)* [Template Engine](#build-your-own-template-engine)* [Text Editor](#build-your-own-text-editor)* [Visual Recognition System](#build-your-own-visual-recognition-system)* [Voxel Engine](#build-your-own-voxel-engine)* [Web Browser](#build-your-own-web-browser)* [Web Server](#build-your-own-web-server)* [Uncategorized](#uncategorized)