To learn advanced physics, a solid understanding of calculus is essential. Watching Khan Academy videos on precalculus and calculus can provide a foundational grasp of techniques like derivatives and integrals, although the depth of understanding may vary. For a more rigorous approach, Courant's "Calculus" is recommended for its motivational style and problem-solving emphasis, while Thompson's "Calculus Made Easy" offers intuitive insights, albeit with some outdated concepts. Michael Spivak's calculus book is praised for its thoroughness and challenging problems, but it may be too advanced for those seeking practical applications rather than theoretical rigor. Overall, a combination of these resources can enhance both calculus skills and mathematical understanding, catering to different learning preferences and goals.