The discussion centers around the use of "Fundamentals of Classical Thermodynamics" by Van Wylen and Sonntag, particularly the 6th edition. The user reflects on their experience with the book, noting its utility as a reference despite not fully utilizing it during their initial studies, which resulted in failing thermodynamics. They plan to read it more thoroughly this time. While the book serves as a reasonable introductory text, other authors like Zemansky, Devoe, and Pitzer are mentioned as providing deeper insights into the subject. The conversation highlights the importance of engaging with the material and the varying levels of depth offered by different thermodynamics texts.