You should read this book, if you care about writing English well.
How did I "discover" this book? Thanks to my son, to the courses he will take in the upcoming (high) school (senior) year. I needed a book to kill my time, and this book caught my eye.
The good thing about this book is you can read it backward! I just finished the last chapter in the 2nd edition, which is about how to write/use email properly. Very useful.