Many people get a book and start reading from the first line without even looking at the table of contents. The correct way is to read a book before reading it, look at the title, preface, table of contents and other information, and have a general understanding of the book to be read before deciding which way to read it.
2. The speed of reading
I used to have the habit of reading. I like to read word by word, and I don't miss a word, which undoubtedly slows down my reading speed. In fact, most people read slower than they can.
The author thinks that most books need to be read quickly, many books are not worth skimming, and only a few books need to be read slowly. So different books need different speeds. Even in the same book, some contents can be skimmed, while others need to be carefully studied.