Hartston William R. The Penguin Book of Chess Openings

Harmondsworth: Penguin Books, 1981. — 256 p. — ISBN 0-14-046-312-7.This book is great for those players trying to decide what type of opening systems are best for them.
The Penguin Book provides an overview of all the common opening variations. And by reading over this book, a player will gain a valuable familiarity with almost all of the openings that he is likely to encounter over the board. This book does not dive deep into any specific opening, but rather gives the reader a basic understanding of all of them. Descriptive notation.