1. Original intention
C language is the most primitive programming language for manipulating data structures and algorithms. There is no high-level language encapsulation, and it can best exercise one's algorithmic thinking and ability.
2. Programming website recommendation
2.1 javatpoint
https://www.javatpoint.com/static-in-c
2.2 includehelp
https://www.includehelp.com/c/
2.3 codeforwin
2.4 Geeks for Geeks
https://www.geeksforgeeks.org/c-programming-language/
2.5 program
https://www.programiz.com/c-programming