It is very important to make the profit and loss ratio appropriate. Some people put it randomly. In fact, the most conservative way is to measure the position between the current price and the resistance and support. This is also what I often use.

Many people calculate the profit and loss ratio of the rise. They will put the support, but ignore the resistance directly, so it looks like the profit and loss ratio is very large, but in reality the profit and loss ratio is one to one