The book "Theory of Sets and Number Systems" offers a solid introduction to fundamental mathematical concepts, particularly in set theory and number systems. It is designed to be read without prior knowledge of mathematics, but it requires basic skills in logical thinking. The content is clearly structured and includes exercises at the end of each chapter that illustrate and deepen the theoretical material. This textbook is aimed at aspiring mathematics teachers and can be used as teaching material in the course "Number Systems." The combination of theory and practical exercises makes it a valuable tool for mathematical education.