Theoretical Mechanics . Connections and their reactions” under the authorship of a team of authors, in particular, with the participation of A. G. Martynova, is an important work in the field of mechanics, which will not leave indifferent students, graduate students and anyone interested in engineering sciences. This edition will be an indispensable assistant for those who want to understand the basics of mechanics more deeply, as well as for practicing engineers seeking to refresh their knowledge and skills in this field. This book explores key aspects of theoretical mechanics, with an emphasis on communication and their reactions, which is fundamental to understanding many engineering problems. The authors have carefully worked out the material to make it accessible and understandable, even for those who are just beginning their journey in the study of mechanics. Each chapter of the book is filled with examples, tasks, and illustrations that help the reader better assimilate complex concepts and put them into practice. The book will be of interest to students of technical specialties, as well as those who are engaged in the design and analysis of structures. It is suitable for both beginners and more experienced readers who want to deepen their knowledge in the field of mechanics. If you study such disciplines as engineering mechanics, construction mechanics or mechanical engineering, then this publication will become a real storehouse of information for you. The topics raised in the book cover a wide range of issues, ranging from the basics of theoretical mechanics to more complex aspects related to the analysis of connections and their reactions. The authors draw attention to the importance of understanding mechanical systems and their interactions, which is key to the successful design and analysis of structures. The book also touches on issues of sustainability and strength, making it relevant to modern engineering tasks. The style in which the book is written is distinguished by clarity and logical presentation .. The authors strive to convey to the reader not only theoretical knowledge, but also practical skills that will help in real engineering situations. This makes "Theoretical Mechanics. Connections and Their Reactions" is not just a textbook, but a real guide for engineers and students. In addition, the team of authors, including A. G. Martynova is known for his other works in the field of mechanics and engineering, which adds additional value to this book. Their experience and deep knowledge in the field of mechanics allow us to create a high-quality and useful product that will be in demand for many years. If you are looking for literature on theoretical mechanics that will help you understand complex issues, and also give the opportunity to apply the knowledge gained in practice, then “Theoretical Mechanics . Connections and their reactions" will be an excellent choice. This book will not only enrich your knowledge, but also inspire new advances in engineering and science.