The discussion centers around finding a suitable textbook covering topics such as crystals, lattices, symmetries, diffraction, microstructure, and mechanical behavior of materials. A participant shares a link to lecture notes that contain valuable material and mentions using a specific textbook in their undergraduate materials science course, which had a focus on less mathematical content. They note that the introductory course requires some prerequisites, including college physics and calculus. Another participant expresses interest in using a textbook for reference in a self-contained materials science course, suggesting that while the recommended book is good, more advanced material may be necessary for those with prior coursework in the subject.