Vital resources for an in-depth understanding of economic policies in UPSC preparation include government reports, economic surveys, and policy documents. Aspirants should also explore established publications like the Economic and Political Weekly and Indian Express for current economic issues. Online platforms offering video lectures and podcasts by experts can enhance comprehension. Engaging in discussions with peers and participating in relevant workshops will provide practical insights into how policies are formed and implemented. Additionally, keeping abreast of economic trends through credible news sources is essential for a well-rounded understanding.