Self-studying physics using Halliday's Fundamentals of Physics requires a foundational understanding of calculus, particularly basic derivatives and integrals, which are essential for tackling physics problems. While some participants recommend more rigorous calculus texts like Spivak for a deeper understanding, others argue that Stewart's Calculus is sufficient for beginners focused on applying calculus to physics. Concerns about Stewart's lack of rigor are noted, but it is deemed acceptable for initial learning. For those preparing for advanced topics, such as quantum mechanics, a stronger grasp of calculus may be necessary. Additionally, participants suggest alternative calculus resources and express the need for accessible formats, such as PDF downloads, for students in regions where physical copies are hard to obtain.