This is the most insightful book on writing I've read. The author's philosophy is simple: the sentence is the fundamental unit of writing. If you focus on making each sentence great, your writing will be great.
He gives practical tips on how to improve your sentences by eliminating non-essential words and he shares his method for sentence creation.
Beyond the quality of the author's writing philosophy, the book is written with a level of intention and concision I didn't know was possible.
The value density of this book is what all books should aspire to be (and only the best books can compete, like Zero to One).