Everything in Bitcoinlandia is fairly superficial, since everyone is trying to sell Bitcoin and make himself rich. So it's like reading multi-level-marketing books.
That being said. What's actually kind of good (with actual technical specifications) is Bitcoin wiki, even when it's slightly outdated; then official bitcoin website; and sometimes bitcoin stack exchange website (but that can become outdated too).
I don't think Blockchain can be disconnected from Bitcoin, and if you do, it's very general and not that specific.