There are four main questions you must ask about any book, found in How to Read a Book: The Classic Guide to Intelligent Reading:

1. What is the book about as a whole? You must try to discover the leading theme of the book, and how the author develops this theme in an orderly way by subdividing it into its essential subordinate themes or topics.

2. What is being said in detail and how? You must try to discover the main ideas, assertions, and arguments that constitute the author’s particular message.

3. Is the book true, in whole or part? You cannot answer this question until you have answered the first two. You have to know what is being said before you can decide whether it is true or not. When you understand a book, however, you are obligated, if you are reading seriously, to make up your own mind. Knowing the author’s mind is not enough.

4. What of it? If the book has given you information, you must ask about its significance. Why does the author think it is important to know these things? Is it important to you to know them? And if the book has not only informed you, but also enlightened you, it is necessary to seek further enlightenment by asking

https://www.fs.blog/2013/06/the-art-of-reading-how-to-be-a-demanding-reader/