1. Variable: A container that holds data with a specific data type, such as int, float, or char.
2. Data Type: Specifies the type of data a variable can hold (e.g., int, float, char).
3. Declaration: The process of specifying a variable’s type before using it.
4. Initialization: Assigning an initial value to a variable at the time of declaration.
5. Constant: A value that does not change during program execution, defined using the const keyword.
6. Function: A self-contained block of code that performs a specific task. C programs are organized into functions.
7. Header File: A file containing declarations and definitions needed for program execution, often included using #include directives.
8. Syntax: The set of rules governing the structure of C code.
9. Statement: A single line of code that performs a specific action.
10. Comment: Text in the code that is ignored by the compiler and is used for documentation or explanations.
11. Loop: A control structure that repeats a block of code until a certain condition is met (e.g., for or while loops).
12. Conditional Statement: A control structure that executes code based on a condition (e.g., if, else, switch).
13. Array: A collection of elements of the same data type, stored in contiguous memory locations.
14. Pointer: A variable that stores the memory address of another variable.
15. Struct: A user-defined data type that groups together variables of different data types under one name.
16. Function Prototype: A declaration that provides information about a function, including its name, return type, and parameters.
17. Recursion: A technique where a function calls itself to solve a problem.
18. File I/O: Input and output operations performed on files using functions like fopen, fprintf, fread and fclose.
19. Memory Allocation: The process of reserving memory for variables and data structures, often using functions like malloc and free.
20. Pointer Arithmetic: Operations performed on pointers, such as addition and subtraction, to access different memory locations.
21. Dynamic Memory Allocation: Allocating memory during program execution as opposed to compile-time allocation.
22. Data Structure: A way of organizing and storing data efficiently, like arrays, linked lists, and stacks.
23. Library: Pre-written code that provides commonly used functions and routines.
24. Header Guard: A preprocessor directive (#ifndef, #define, #endif) used to prevent multiple inclusion of the same header file.
25. Bitwise Operations: Operations that manipulate individual bits of data.
26. Dereferencing: The process of accessing the value pointed to by a pointer using the * operator.
27. Enum: A user-defined data type consisting of named integer constants.
28. Type Casting: Converting a variable from one data type to another using casting operators like (int) or (float).
29. Debugging: The process of identifying and fixing errors in the code.
30. IDE (Integrated Development Environment): Software that provides tools for coding, compiling and debugging, enhancing the development process.

These terms cover a range of concepts from basic to advance in C programming. Learning and understanding them will help you become proficient in the language.