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C Tutorial - W3Schools
Learn C Programming
Learn C - Free Interactive C Tutorial
The C Programming Handbook for Beginners - freeCodeCamp.org
C Programming Language Tutorial - GeeksforGeeks
Learn C - Codecademy
Learn C: Introduction - Codecademy
Programming in C - Coursera
C Courses & Tutorials - Codecademy
C for Everyone: Programming Fundamentals - Coursera