ISO quality management system training courses should all talk about: the core content of quality management is eight management principles.

Principle 1- customer-centric

Principle 2- Leadership

Principle 3- Full participation

Principle 4- Process Method

Principle 5- System Management

Principle 6- continuous improvement

Principle 7- Make decisions based on facts.

Principle 8- mutually beneficial supplier relationship

If you are asking about the core mode of quality management, it is PDCA cycle mode.