The discussion centers on the best approach to studying Calculus independently after reading Lang's Basic Mathematics. Participants recommend starting with Lang's A First Course in Calculus rather than Spivak's Calculus, which is viewed as too challenging for beginners. Lang's book is praised for its intuitive approach and clear proofs, making it suitable for those with some rudimentary calculus experience. However, there are critiques regarding its treatment of limits, which some find cursory and lacking in rigor compared to what is covered in formal calculus courses. While Lang's intent is to avoid overwhelming beginners with rigorous definitions, there is a consensus that a more comprehensive introduction to limits would be beneficial. Overall, the recommendation is to progress from Lang to more rigorous texts like Spivak or Apostol after gaining a foundational understanding of calculus.