According to the daily K-line chart of the fund in the market, when the ETF price is low, you can buy it appropriately. Encountering the previous high point indicates that the pressure level has appeared and needs to be sold properly.

For example, Shanghai and Shenzhen 3000ETF used to have a low price of 1.5 yuan and a high price of 2 yuan. At this time, 1.5 yuan is the support level and 2 yuan is the pressure level, so investors only need to fluctuate within this price range.

Tip: Band operation is only suitable for OTC funds, not OTC funds. OTC funds only have a daily net value, and investors don't know what stocks the fund manager bought. If OTC funds do band operation, it is easy to operate frequently, chasing up and down.