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Grasping the basics of C is not a lengthy process. What are you stuck on? C is a fairly minimal language to begin with -- maybe I have a biased point of view also having a C++ background, but C is still very simple. Really the most complex things that are also somewhat common in C are function pointers, pointer to pointers, pointer arithmetic, bit fields, and a couple other things, but there's not a lot. Everything else is conceptual or not really part of the language in itself, but provided for or with the language or the idea of the programming language for lack of a better general explanation -- inline asm, compiling & linking, makefiles perhaps, bitwise math, and others.