Six arts refer to six skills: courtesy, music, archery, imperial command, calligraphy and numeracy.

ceremony: etiquette (similar to moral education today).

music: music.

shooting: archery technique.

Yu: the skill of driving a carriage.

Books: refers to six books of calligraphy (writing, literacy and composition): pictographic, indicative, knowing, pictographic, phonetic, annotation and borrowing.

number: number refers to rational number and qi number (the law of using methods), that is, the movement law of yin-yang and five elements.

The aristocratic education system of the Zhou Dynasty in China began in the Zhou Dynasty in 146 BC, and Zhou Wang Guan required students to master six basic talents: courtesy, music, archery, imperial command, calligraphy and mathematics.

Extended information:

Four Books, Five Classics and Six Arts

Four books refer to Daxue, The Doctrine of the Mean, The Analects of Confucius and Mencius;

The Five Classics refer to The Book of Songs, Shangshu, Book of Rites, Zhouyi and Chunqiu, which are called "Poems, Books, Rites, Changes and Chunqiu" for short. Actually, there should have been six Classics, and there is also a Book of Music, which are collectively called "Poems, Books, Rites, Music, Changes and Chunqiu".

there are two ways to say six arts. One is the six basic abilities that China ancient Confucianism required students to master, including courtesy, music, archery, imperial command, calligraphy and numeracy. Rite is etiquette, music is music, shooting is riding technology, royal is driving the carriage technology, books are calligraphy, and numbers count.

there is another saying that the six arts are interpreted as the six classics, namely the Book of Changes, Shangshu, Shijing, Book of Rites, Yue Jing and Chunqiu. It is the core carrier of Confucianism and an important part of China traditional culture.

Baidu Encyclopedia-Six Arts