The core concept of the Chán theory is that market trends ultimately achieve perfection. Its essence is that any type of trend at any level will eventually complete, meaning that the process from "birth" (generation) to "residence" (continuation) and then to "death" (transformation) is bound to occur.

Around this core, two key tools have emerged to define and analyze trends:

- Central: It is the "chip accumulation area" formed by repeated fluctuations of prices at a certain level, akin to the market's "gravitational center", which determines the direction and intensity of the trend.
- Fractals and strokes: They are the "smallest components" that make up price movements. Through the top fractals and bottom fractals of candlesticks, they connect to form strokes, which then create segments, ultimately building a complete price movement structure that includes the central region.