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Want to learn C? I think I learned it by looking at code and some GNU manuals. These days the early editions of the book written by the creators of C is available for free. Who cares about how old it is. Search for “K&R C free” to find more interesting material like tutorials.
Since I believe in actual projects, the “write your own text editor” booklet seemed like a great idea!
https://archive.org/details/CProgrammingLanguage2ndEditionByBrianW.KernighanDennisM.Ritchie
https://www.gnu.org/software/gnu-c-manual/
https://www.gnu.org/software/libc/manual/
http://www.freetechbooks.com/c-programming-tutorial-k-r-version-4-t219.html
https://viewsourcecode.org/snaptoken/kilo/