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How to Design Systems That Keep Working as They Grow, Fail, and Change A program can work perfectly on one machine with one user and still collapse when exposed to the real world. Why? Because once so
How to Build Software That Humans Can Understand, Change, Test, and Trust Writing code is only a small part of software engineering. A program can be: logically correct, syntactically valid, fast e
Programming is the skill of taking an idea and expressing it so precisely that a computer can execute it. At the lowest level, programming is about: data + instructions + memory + control flow At hig
Data structures answer one fundamental question: How should I organize information so that the operations I care about become easy? The same data can be stored in many ways. Suppose we have: Alice →
An operating system sits between: Your Programs ↓ Operating System ↓ Computer Hardware When you write: print("Hello") you are not directly controlling the screen. When you open a file: ope
Computer architecture is the bridge between: the code you write and the electrical machine that actually executes it. When you write: c = a + b; you see one line of code. The computer sees something
Modern software rarely lives inside one computer. A robot might have: a main computer, a microcontroller, a LiDAR, multiple cameras, a GPU computer, a remote dashboard, a cloud server, another
A robot is almost never doing one thing at a time. While a mobile robot is moving, it may simultaneously be: reading wheel encoders, receiving LiDAR scans, capturing camera frames, estimating its
Theoretical computer science is not mainly about writing code. It is about understanding the fundamental nature of computation. It asks questions such as: What exactly is an algorithm? How do we kno