Check every game afterwards if you indeed didn’t violate her principles and you will start winning more games without any doubt.
opening principles book recommendation

Check every game afterwards if you indeed didn’t violate her principles and you will start winning more games without any doubt.
The conventional wisdom seems to be that newer players should not focus on specific openings, but just on opening principles. That makes sense to me. One challenge I see is that there are not many books on opening principles. I'm currently reading through John Emms - Discovering Chess Openings. Any other recommendations? Thanks!