It's ok for an absolute beginner who has no prior knowledge of, or formal exposure to chess openings. However there are other introductory books on openings which I would recommend in lieu of Robertie's book...
Good Chess Openings Books For Beginners and Beyond...
https://www.chess.com/blog/RussBell/good-chess-openings-books-for-beginners-and-beyond
in particular, for an excellent first introduction to openings principles for the beginner-novice I would recommend "Discovering Chess Openings" by John Emms. It is commented on in the link above.
Chess Openings Resources for Beginners and Beyond…
https://www.chess.com/blog/RussBell/openings-resources-for-beginners-and-beyond
https://www.chess.com/blog/RussBell
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