Fund managers may change positions every trading day, because fund managers will assess the situation, track every potential stock, buy at a relatively low level, and throw out stocks with large gains. Investors only need to trust the fund manager.
Every fund manager's position changing action has his logic, because there is a professional team behind the fund manager.
Fund, in English, refers to a certain amount of funds set up for a certain purpose. It mainly includes trust and investment funds, provident funds, insurance funds, retirement funds and funds of various foundations. From the accounting point of view, capital is a narrow concept, which refers to funds with specific purposes and uses.