Take the stock as an example, when the stock price runs for a period of time, it cannot continue the previous trend for some reason, and then fluctuates within a price range, leading to sideways or a certain range of consolidation, forming a price platform. Then the stock price breaks through this platform (either rising or falling), which is called platform breakthrough. The figure of the standard triangle breakthrough theory is as follows, and there are also formulas: one does not rise, the other does not, however, the third breakthrough, the breakthrough step back to confirm the main rising wave, how wide it is horizontally and how high it is vertically, that is, the doubling theory.