dajava wrote:

I have only one chess book, which covers all the aspects of the game

Now, I want to buy a chess opening book for the first time in my life.

I am a very low level player as you can guess.

Any recommendations?

While not specifically about openings, I, as a beginner, am finding
Logical Chess Move by Move, by Chernev, to be an excellent book. It
discusses every single move of more than 30 games, and naturally covers
the basics of opening theory.

Kirk