https://technotip.com/7949/pointer-to-a-pointer-in-c-programming-language/
Lets write C program to learn the concept of pointer pointing to another pointer. It's also called as Multiple Indirection or double pointer concept.
Note: We could go any level deep. For Example, a pointer can point to a pointer which is pointing to another pointer, which is pointer to a pointer pointing to another pointer and so on.
But only 2 concepts hold practical usage in our programs:
1. The pointer concept.
2. Pointer to Pointer concept.
C Programming Interview / Viva Q&A List
https://technotip.com/6378/c-programming-interview-viva-qa-list/
C Programming: Beginner To Advance To Expert
https://technotip.com/6086/c-programming-beginner-to-advance-to-expert/