To effectively approach Rudin's "Principles of Mathematical Analysis," a solid foundation in calculus is essential, along with a basic understanding of linear algebra. Familiarity with proofs is also important, making a resource like "How to Prove It" by Velleman beneficial for beginners. While some suggest studying Axiomatic Set Theory and topology beforehand, opinions vary on their necessity. Munkres' "Topology" is recommended as a useful companion text. For self-study, having access to knowledgeable individuals, such as professors, can enhance understanding. Additionally, MIT's open courseware provides valuable resources, including solutions to problems from Rudin. For a gentler introduction, Kenneth Ross's "Elementary Analysis" is suggested as a preparatory text.