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Since it was in the Wei and Jin Dynasties, it should be the rules and methods written and summarized by calligraphers at that time (Wei and Jin Dynasties rather than other periods).
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Therefore, we can say with certainty that the following rules and methods are the cultural heritage left by calligraphers in Wei and Jin Dynasties:
(1) Eight methods;
(2) Nine potentials;
(3) Twelve strokes.
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The above three categories overlap in part, but each has its own emphasis. Eight methods are mainly based on brushwork (Mr. Shen thinks it is about brushwork, but this view is not very convincing; Teacher Shen is an expert in classical poetry and is not familiar with classical aesthetics and philosophy. Nine strokes are about brushwork (including several strokes), and twelve strokes are about aesthetic principles (Mr. Shen explained some dialectical truths, but mainly regarded brushwork as brushwork). )。
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As for how to understand, I think we should first understand the rhetorical devices (writing techniques), reasoning methods and thinking categories used by scholars at that time.