The theoretical basis of band operation is wave theory, that is to say, the fluctuation of stock price is like the tide generally has peaks and valleys. When buying and selling stocks, you should buy them at the valleys and sell them at the peaks. Interested friends can learn wave theory. The concept is simple, how to operate it? There are two methods for common band stock selection and operation. First, the use of medium-and long-term moving averages for stock selection operation. The eight trading rules of American investment expert Granville&;s moving averages are based on the medium-and long-term moving averages. The blue line in the figure below indicates the medium-and long-term moving averages. For most stocks, it is generally a medium-term moving average between 30 and 60 days. What needs special reminder is that the description corresponding to each trading point in the above picture is very important. Be careful to understand. For example, as shown in the following figure, the 60-day deviation rate can be sold at around 30 at high level and -20 at low level. Second, use the trend line for stock selection. This is to use the method of drawing channels to buy and sell, sell on the upper track of the channel and buy in the lower track. It should be noted that it is necessary to draw channels on the weekly line, not to draw channels with too short a period, which is generally easy to fall into frequent trading. This channel, regardless of the direction, the key is to control the position well, buy when the stock price in the support position is up, and gradually sell when it is close to the top pressure line. Once you break through the support, you must sell short unconditionally! But the best way is to do the band in the upward channel. This kind of operation, based on the medium and long term, requires patience. Profitability must belong to patient people, who frequently do short-term, with high cost and easy to get lost. Your praise forwarding is my greatest encouragement! Please pay attention, you can learn and communicate with each other alone, or you can leave a message in the comment area! Thank you.