1, fractal, pen, line segment, line segment destruction leads to the end of the previous line segment.

2. Use trend, center and deviation to judge the current deviation, so as to judge the end of the trend.

Personally, I think the first method is purely for learning and has no practical effect. That's a way for beginners to know what "end" is, that is, behind it. Because in simple terms, the end of the line segment due to destruction is the end after the trend level of the line segment has regressed. Backward itself is not easy to understand, but the destruction of line segments is relatively easy to understand. That is to say, you can find and analyze the damage of the line segment in the historical graph, and the end point of the damaged line segment is the backslide point, so that you can know the position of backslide from the starting point, which is convenient for you to learn to use backslide and actually operate it in the future.

So from the above, the line segment is not the unit scale of operation, but the unit scale of learning. Only by truly understanding the status quo of retrogression can we actually operate.

From a complex point of view, when you understand backlash through line segment destruction, you only complete the first step of a simple cycle, and then you may rethink line segments, centers and trends because of your understanding of backlash. Then go round and round, constantly improving.