Ever have to write a report? Send an important email to a boss or client? Use quotations or other references in a presentation? Copy editing, proofreading and typesetting (or general layout) used to be specialised jobs when the only way your words were going to be put in front of the public was after they'd been through a setting, proofing and printing process and appeared in solid form as a book, brochure or pamphlet.
In the last 20 years, we've all become self-publishers, so why not get things right? 1970s or 1970's? What do you call a fish with four i's? Does that look right?
This book was recommended to me by a professional copy editor and if you care about abbreviations, capitalisations, dialogue layout, use of foreign phrases etc. etc. you'll enjoy this book. If you ever have doubts about things like this, you'll find it useful too.
I speak as someone who does rely on the written word a great deal although I'm not a professional writer or editor - I don't believe there's any single universal resource that covers all aspects of writing - and presenting - English in a consistent and clear way but if you're the sort of person that has a couple of different dictionaries, at least one edition of Fowler and who sometimes wonders despairingly whether it's time to give up on the distinction between imply and infer and accept that an elephant is a creature of considerable enormity I'd warmly recommend this book.