Major life decisions (such as career, partners, or entrepreneurial directions) should not rely on fleeting emotions, intuition, or "Eureka moments," but should be treated as a system that can be repeatedly optimized. This "system engineering" includes long-term accumulation of self-awareness (interests, strengths, values), understanding of the laws governing the world, and building judgment models through reading, thinking, and trial and error; at the same time, using probabilistic thinking to evaluate the long-term returns of different choices, and leaving room for iteration and correction. In other words, good decisions are not the result of a one-time snap judgment, but the product of long-term learning + rational analysis + small-step trial and error working together.