Qi Men Dun Jia, historically a secret Chinese military strategy tool, has evolved into a comprehensive system for modern decision-making, focusing on strategic positioning and timing. It utilizes a "cosmic map" featuring Nine Palaces to analyze Earth, Heaven, Man, and Spirit plates for optimized outcomes in business and life. To explore this topic further, see this overview at discoveringrncp.hk
Many PDFs focus only on the Yang Zhai (residential) usage. These shorter documents teach you how to locate the "Wealth Gate" or "Marriage Star" in your house using QMDJ. These are usually 20-30 pages. Qi Men Dun Jia.pdf