The essential concept of C programming revolves around mastering the fundamental principles of procedural programming and understanding the language's syntax, data types, and control structures. A crucial aspect is the emphasis on manual memory management, providing programmers with direct control over memory allocation and deallocation. The book likely covers the importance of pointers and their role in manipulating memory addresses efficiently. Additionally, C's modular approach through functions and the concept of libraries is likely highlighted, encouraging the creation of modular and reusable code. The understanding of input/output operations, file handling, and the use of structures and unions to organize and represent data further solidifies a comprehensive grasp of C programming concepts. The book may also delve into advanced topics like dynamic memory allocation, recursion, and the preprocessor directives, empowering programmers to write efficient and robust code in the C language.