What theoretical bases underpin civil engineering practices? How do principles of mechanics, materials science, and structural analysis contribute to the design and construction of infrastructure? Furthermore, what role do environmental considerations, geotechnical principles, and sustainability play in shaping civil engineering methodologies? Exploring the interdisciplinary nature of civil engineering, delve into how these theoretical foundations inform decision$-$making processes, enhance structural integrity, and address societal needs, ensuring the resilience and longevity of infrastructure projects.