For comprehensive General Studies preparation for UPSC, essential resources include standard textbooks, national newspapers, and reputable online courses. Key subjects like History, Geography, Polity, Economy, and Environment each have specific recommended readings, such as NCERT books and references from authors like Ramesh Singh. Monthly magazines like Yojana and Kurukshetra provide focused current affairs insights. Additionally, utilizing online platforms for interactive learning and joining discussion forums can further enhance understanding and retention of vast topics relevant to the UPSC syllabus.