"Fundamentals of Structural Mechanics" is a technical book that deals with the fundamental principles of structural mechanics. In recent decades, the application of numerical calculations in strength and structural mechanics has significantly increased. This development has created a gap between traditional courses in strength theory and modern methods such as finite element analysis. The book aims to bridge this gap by focusing on the fundamental principles and formulations that are relevant to engineers. It is argued that the ability to perform calculations has surpassed theoretical formulation, meaning that the understanding of continuum mechanics has become accessible to a broader engineering community. The content is designed to be beneficial for both students and professionals who wish to engage with the modern challenges of structural mechanics.