Nick de Firmian book
Book for opening

Personally I prefer videos, but some people like books.

MCO was a wonderful book in it's time, but with the ready availability of databases most players seem to prefer opening books that have a lot of explanations of why moves are made. Paul van der Sterren's Fundamental Chess Openings does just that and is generally considered the gold standard for one volume opening books. In many ways it's an update and expansion of Reuben Fine's classic The Ideas Behind the Chess Openings.
Hi all,
can anyone suggest me the best book were to study the chess opening?
Thank you very much everybody.