This article has a great tip on reading non-fiction: do not read non-fiction word-for-word like fiction books. Fiction requires that the reader immerse in the author’s world. Non-fiction tries to convey an idea.
Here is method from linked article.
- Start with the author
- Read the title, the subtitle, the front flap, and the table of contents.
- Read the introduction and the conclusion.
- Read/skim each chapter.
- End with the table of contents again.
See the original article for the full explanation of the method.