What is the way for Confucius to give lectures freely in the materials?

Establish private schools and recruit disciples. Confucius is the founder of Confucianism, the core theory in China culture. The way of Confucius "giving lectures freely" in teaching materials is to set up private schools and recruit disciples; His educational thoughts include teaching students in accordance with their aptitude. The "golden age" refers to the situation in which a hundred schools of thought contend in the ideological and cultural fields during the Spring and Autumn Period and the Warring States Period. Confucius initiated free lectures among the people, and a golden age of China's academic thought history began to appear. It is radiant and dazzling, and it has become the most glorious era in the history of human cultural development.