Of the thousands and thousands of C-related Web sites, we've identified a few you might want to familiarize yourself with up front. But first, a couple of things you should know about C Web sites:
Because of the connectedness of the two languages, you'll often see sites that discuss both C and C++. From these you'll have to filter out the information that doesn't pertain to you (namely, the C++ stuff). Second, many of the available resources stem from university settings (which can be great, but specific in scope) or provide technical documentation, rather than detailed explanation (which can be less useful when you're just learning).
With that in mind, here are a few good C Web sites, with a brief description of each: