How to get the most out of your data? How to make decisions based on data? How to organize data analysis (data science) within a company? Who to hire as an analyst? How to bring machine learning and artificial intelligence projects to the top level? Roman Zykov knows the answer to these and many other questions, because he has been analyzing data for almost twenty years. Roman’s track record includes creating his own company from scratch with offices in Europe and South America, which has become a leader in the use of artificial intelligence (AI) in the Russian market. In addition, the author of the book created analytics in Ozon.ru from scratch. This book is intended for thoughtful readers who want to try their hand at data analysis and create services based on it. It will be useful to you if you are a manager who wants to set tasks for analytics and manage it. If you are an investor, it will make it easier for you to understand the potential of a startup. Those who are building their own startup will find here recommendations on how to choose suitable technologies and recruit a team. And for beginning specialists, the book will help broaden their horizons and begin to apply practices that they had not thought about before, and this will distinguish them among professionals in such a complex and changing field. The book does not contain examples of program code, there is almost no mathematics in it. The publishing layout is preserved in PDF A4 format.