Reflects my personal opinions only.
1) I love how it goes straight to the point - questions are the driving engine for an enriching life. And I feel by adopting this mindset, I tend to be less intimidated by the unknown parts of the world which I don't have answers yet, but more comfortable and interested in it because it can be better understood through questions.
2) How it categorized the elements of thinking into 8 parts: the question that started it, the purpose, the information needed, the inferences made, the concepts and assumptions used, the point of view, and the implications. This is really helpful, especially to scientific researchers, but also applies to general thinking in life.
3) How it analyzed the process of thinking: the elements in bullets 2), the precision and levels of details, it's objective or subjective, and so on.