The discussion centers around resources for self-studying calculus, highlighting various recommended textbooks. "The Complete Idiots Guide to Calculus" by Michael Kelley is praised as an excellent resource. Other notable mentions include "Calculus Made Easy" by Silvanus P. Thompson, "Differential and Integral Calculus" by Richard Courant, and "Calculus" by Anton, Bivens, and Davis, which is emphasized as a comprehensive choice for serious learners, particularly for multivariable calculus. The importance of a solid foundational understanding is stressed, with warnings against relying solely on easier texts like those by Sherman Stein, which may not adequately prepare students for advanced topics. The discussion also points to the availability of free online calculus resources and suggests combining textbook study with lecture materials, such as MIT's online courses, for a more effective learning experience.