Where can I learn C programming for free?

The C Programming Language course is designed to give you everything you need to become a productive C programmer.

LearnCpp.com is a free website devoted to teaching you how to program in C++. Whether you’ve had any prior programming experience or not, the tutorials on this site will walk you through all the steps to write, compile, and debug your C++ programs, all with plenty of examples.

20 Ways To Learn C Programming For Free