Holistic ways to stay informed about national and international affairs for UPSC include regular reading of newspapers, following credible news websites, and utilizing news apps. Subscribing to magazines and journals focused on current affairs enriches understanding. Engaging in discussions with peers or participating in online forums can deepen insights. Additionally, watching debates and talk shows can provide diverse perspectives on pressing issues. Keeping an organized notes system to summarize important developments helps track ongoing issues and facilitates effective revision.