Chess Fundamentals is a book anyone can find space on their shelf for. However, before going further, I'd like to remind people this is a self-teaching book, not a reference. Many have complained that this book is sparse on explanations and that Capablanca left the student to find most variations. They seem to have lost the point that this book is meant to teach through hands-on experience, the best method, rather than by just telling everything.
Treatise aside, this book is superb. It has a great focus on endgames and explains the opening well. The only fault I could find was that the middlegame section focused too much on combinations and not enough on positional play--however, positional play could take 100 books to fully explain, so it doesn't really matter. After reading this book, my rating on playchess.com rose by over 300 points! I highly recomend it.