This book is intended for anyone who wants to study the principles of writing code. The important thing is to think well before programming. After a brief history of the development of calculators and computers, you will learn how to design algorithms using everyday examples, such as a recipe of a cheese soufflé, a bubble sort, and a sequential and dichotomous method to sort out numbers in a list. You will discover how to program with Excel VBA and JavaScript adapted to Google Sheets. The objective of this manual is to help you understand how to automate repetitive tasks, while discovering the world of variables, loops, conditions, functions and procedures. Finally, because Internet pages are part of our daily lives, HTML and CSS will also be introduced.<br><br>ABOUT THE AUTHOR<br><br><b>Rémy Lentzner</b> has been a computer trainer since 1985. Specialized in the mastery of office automation tools, he assists companies in the professional training of their employees. Self-taught, he has some fifteen computer books to his credit.