The problem set includes questions from classic books such as K&R, as well as challenges from popular online coding platforms like Leetcode and HackerRank.

Prerequisite
Basic knowledge of C programming. Also I would like to advice you to have a HackerRank and Leetcode account. So that you can directly go there and solve problems. Have an editor setup to run the code. Editors like Neovim, VS Code, C Lion can be used.

Resources
1. K. N. King Modern C Language Book
2. K & R The C programming Language
3. Online Docs
4. Youtube Tutorials