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How many times a day do we rely on an electronic device, often without even noticing it? From smart washing machines and connected refrigerators to phones, cars with assisted driving, and medical diagnostic systems, the modern world is powered by astonishingly complex electronic machines. Yet at their core, all these systems, whether guiding a spacecraft or preparing a perfect cup of coffee, are built from the same fundamental components. This book offers a clear, accessible journey into the inner workings of computers and electronic systems. It explains how billions of interconnected transistors, each behaving like a simple switch, combine to perform logical operations using only 1s and 0s. Step by step, it reveals how these basic building blocks enable machines to make decisions, execute programs, and carry out the sophisticated tasks we depend on every day. Written with the curiosity of a daughter determined to explain modern technology to her father, born in the last century, this book demystifies the architecture of hardware and the structure of software without assuming prior technical knowledge. Through intuitive examples and engaging storytelling, it shows that behind the apparent magic of digital technology lies an elegant and comprehensible logic. Perfect for curious readers, Teaching My Dad How Computers Work is an invitation to understand the digital world and to discover how simple ideas, multiplied billions of times, shape the intelligent machines around us.