Imagine you charge $69 an hour as a developer. Learning the proper way to think about building resilient CSS layout will save you tens of hours throughout your career by building things the right way from the beginning.
May I know what are the other two? I read Every Layout for the past hour and it's good so I'd like to read something else of similar quality in the future.
Also, how did you come across those books? I just found out about Every Layout in this thread. I'm not a web developer so I don't know if it was advertised in a web dev forum or what.