This repository is a step-by-step tutorial for building an operating system from scratch, progressing from a simple boot sector to a kernel with interrupts, memory management, and a basic shell. The code is organized into sequential lessons, each building upon the previous. The system boots via a custom boot sector, loads a kernel into memory, transitions to 32-bit protected mode, sets up interrupt handling (including timer and keyboard), and provides a shell that can echo user input and handle basic commands like 'END' to halt and 'PAGE' to test memory allocation. While educational and well-commented, the codebase shows signs of abandonment per the README, though the last commit date indicates recent activity. The architecture is monolithic with modular components for bootloader, kernel, drivers (screen, keyboard, timer), and a lightweight libc.