What are the characteristics of seal script fonts, and what skills and precautions are there in writing?

A style of ancient Chinese characters. There are big seal and small seal. Originally named Wen Zhuan, Da Zhuan began at the weekend and was later exercised in the State of Qin. Xiao Zhuan, also known as Qin Zhuan, refers to the characters used by Qin Shihuang to unify the characters, which were used in the Han Dynasty. Later generations called seal script, generally referring to Xiao seal script. There are stone carvings such as Mount Tai, Langxie, Yishan and Huiji. , and countless Qin Liang, Qin Quan and imperial edicts. Chinese characters have been standardized, and radicals have a fixed form and position. The shape is a vertical rectangle, and the space is filled with strokes as much as possible.