Investing in stocks is a highly professional task. In a fund management company, investment work can be divided into three parts: first, the investment decision-making committee grasps the trend of economic fundamentals and market preferences in a "top-down" manner; second, researchers study companies "from bottom to top" and incorporate excellent companies into the core stock pool; third, the fund manager builds an investment portfolio within the intersection of the fund style stock pool and the core stock pool.