What did the Japanese learn from China in the Tang Dynasty?

During the Sui Dynasty in China, Japanese students were gradually sent to China and reached the peak in the Tang Dynasty.

Mainly studying in China.

Pottery industry

Sowing technology, using farming time, that is, sowing and harvesting corresponding to the lunar solar terms.

Textile industry, dyeing and weaving technology

Paper industry, Xuan paper technology

Brush making, hard pen = wolf hair; Soft pen = wool; Soft and hard pen = wolf wool (now lost)

Ink manufacturing

Powder technology, yellow powder technology, raw materials: carbon, nitrate and sulfur as the main raw materials,

Chinese character split writing technology (now converted into Hiragana, Katakana and He Zi)

Take Japanese architecture, Nara and Kyoto as examples.

The only thing I haven't learned is the disunity of China people.