These files are available under a sort of "open source" concept. They are intended for educational use but really can be used for whatever the fuck you want. You don't need to credit me for whatever commercial or non-commercial use you make of them, but if you could shout me a holla with any project that do come from them, I'd love to see it :)
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This dude has some frigg'n crazy ass in-depth tutorials that focus on how to achieve certain looks or effects. He sort of assumes a certain level of proficiency with Cinema 4D and After Effects though so if you're really starting out, this prolly isn't the place.
This is a really great resource for people starting out. 3DKiwi is the fucking man and has a redonkulous amount of awesome in depth tutorials that can take you from installing the software day one to Cinema 4D boner-master in no time!