Does any one know of any good self study resources (or online courses) on this subject?
This is a good course about architecture http://www.nand2tetris.org/course.php
This is likely to be horrible advice. I don't doubt that there are good C tutorials on youtube, but there are probably also hundreds of extremely poor tutorials that are seductive and even highly rated because the people rating don't know better.
K&R C is excellent. I don't like overbearing advice, but "Every serious programmer should read K&R C" isn't bad as far as such advice goes.
I don't particularly like the "Learn X The Hard Way" series (maybe it is the right way, but I find it too painful), but there is Learn C The Hard Way [0].
I'm at exercise 19 and enjoy it so far. I think I already learned a lot. It may not suite everybody and I don't even know if it's good, though.