Elementary Textbook of Physics . Fluctuations and Waves . Optics. Atomic and Nuclear Physics by G. C. Landsberg is not just a textbook, but a real find for everyone who seeks to better understand the laws of nature and the physical phenomena that surround us in everyday life. Landsberg, a well-known Russian physicist and educator, masterfully combines theoretical foundations with practical examples in his work, which makes it available both for students and for a wide audience interested in physics. This tutorial addresses key topics such as vibrations and waves, optics, atomic and nuclear physics. Each chapter is imbued with logic and sequence, which helps the reader not only to assimilate the material, but also to see the relationship between the various sections of physics. Landsberg not only expounds facts, but also immerses the reader in the world of physical laws, forcing him to think about how they affect our lives. For example, he explains how wave processes underlie many modern technologies, from communication to medicine. This book will be of interest not only to students of physical and mathematical faculties, but also to anyone who wants to expand their knowledge in the field of natural sciences. It is suitable for both high school students preparing for exams, and adults who want to refresh their knowledge or simply immerse themselves in the fascinating world of physics. Landsberg addresses the reader with respect and understanding, which makes his text accessible and fascinating. The topics raised in the book are relevant and important for modern society. With the rapid development of technology and science, understanding of physical processes becomes necessary for everyone. Landsberg's book helps us to understand how physics permeates all areas of our lives, from simple phenomena such as sound and light to complex processes occurring at the atomic level. The reader will be able to learn about how lasers work, how fiber information is transmitted and what laws regulate nuclear reactions. The author’s style is distinguished by clarity and logical presentation . Landsberg skillfully uses real-life examples, which makes the material more visual and understandable. His approach to learning is based on the principle of “from simple to complex”, which allows the reader to gradually delve into the topics being studied. In addition, the author includes in the text many illustrations and diagrams that help to visualize complex concepts and make the learning process more interactive. G. C. Landsberg is the author of many other well-known works, including “Elementary Textbook of Physics . Mechanics" and "Elementary Physics Textbook. Electricity and magnetism" . Each of his books is distinguished by a high quality of presentation and a deep understanding of the subject, which makes them indispensable for all who seek knowledge. Elementary Textbook of Physics . Fluctuations and Waves . Optics. Atomic and Nuclear Physics is not just a textbook, but a whole world worth diving into. It inspires the study of physics, opens new horizons and helps to understand how our world works. If you are looking for a high-quality and fascinating physics textbook, this work will be an excellent choice. Do not miss the opportunity to expand your knowledge and look at the world from a new perspective!