ETF index fund is most suitable for short-term band, passively copying the index trend, and the position will not change greatly. You just need to predict the trend of the index.

Index fund is a kind of fund with the principle of fitting the target index and tracking the change of the target index to realize the synchronous growth with the market. The investment of index funds adopts the investment strategy of fitting the target index return rate, and invests in the constituent stocks of the target index in a diversified way, and strives to fit the stock portfolio return rate with the average return rate of the capital market represented by the target index.