Comment by wmwragg

Despite what many think, I'd say the "The C Programming Language (2nd Edition - ANSI C)" by Brian Kernighan & Dennis Ritchie (K&R) book is still a good introduction to C. It doesn't go into best practices, or other forms of more advanced C programming, but it teaches C well. I'd pair it with "Understanding and Using C Pointers: Core Techniques for Memory Management" by Richard M Reese to get a good understanding of the pointer underpinnings of C. They are both small, well written and easily digestible.