This book, "A Conceptual Approach from Electron to Electronics-Diode to Transistor-Transistor to Logic Gates-Logic Gates to Microprocessor," is tailored for students embarking on a beginners' journey in electronics. It aligns with the current syllabi of basic electronics across various educational streams, including Physics (Honours), Diploma, B.Tech., and BCA programs, as well as curricula prescribed by different universities and technical institutions. Designed to offer a practical understanding of electronics fundamentals, the book caters to senior secondary students in classes XI and XII, particularly those enrolled in vocational courses. Fundamental ideas are the foundation of all advanced technology. It is based on speed, accuracy and miniaturization of a semiconductor chip. The invention of Electron was breakthrough towards the modernized shape of Electrical, Analog Electronics, Digital Electronics and Microprocessor. From Electron to Electronics, from Diode to Transistor, from Transistor to Logic Gates from Logic Gates to Chips (Integrated Circuits), from group of ICs to Microprocessor, From microprocessor to Super computer, From Super computer to Quantum computing. This book has been composed in a way that students can get the concept of basics in sequence of three sections as Part- I: Analog Electronics, Part-II: Digital Electronics and Part-III: Microprocessor.