Yeah, online tutorials are likely to have 1000x more errata in them as well since there has been zero proofreading done. I've seen some simply atrocious ones. Another problem is that since the authors of online tutorials generally don't get paid for their work, their motivation to continue wanes after the first few installments.

Download "Thinking in C++." Best online C++ book by far.

Isn't "The C Programming Language" by K&R available for download as pdf too?
I've seen it in a few places although I was never sure if it was a legal download or not. One location was a college website if I recall.