While this subset has been famously dubbed "The Good Parts", I would implore you, dear reader, to instead consider it the "The Easy Parts", "The Safe Parts", or even "The Incomplete Parts".
Here, we address head on the tendency of JS developers to learn "just enough" to get by, without ever forcing themselves to learn exactly how and why the language behaves the way it does. Furthermore, we eschew the common advice to_retreat_when the road gets rough.
These books each take on specific core parts of the language which are most commonly misunderstood or under-understood, and dive very deep and exhaustively into them. You should come away from reading with a firm confidence in your understanding, not just of the theoretical, but the practical "what you need to know" bits.