The book contains some general rules but also gets into some very specific ones about when and how to use certain parts of speech, tenses, etc. What this book and so many like it would not consider is that language is fluid and ever changing. As I grow in understanding, my language peeves no longer seem important. (E.g. weakening the past participle of an irregular verb such as "to light" from "lit" to "lighted.") Modern usage and style seems to be governed by the style books put together by major newspapers for their staffs.So the book I have has become a bit out of date as rules and language change. People, the ordinary users of language, begin sentences with "and" and end them with prepositions. Rules should exist to assist language, not repress it.
I'll treasure the book. It shows where language has been and proves it can not be contained.