C Programming for Beginners may not be as polished as the other courses on this list, but if you prefer the Udemy format or already have a subscription, it offers a solid foundation for those ...

Apple is the latest tech giant to highlight security problems with C/C++ code in operating systems. The company is addressing memory safety in XNU, the kernel for iOS, macOS, watchOS, and more.

Several people are going to recommend The C Programming Language by Kernighan & Ritchie; it's a good book, but it's getting a bit long in the tooth and doesn't cover the C99 standard.