Virtual data projects are sold at zero cost through the automatic transaction system, which is legal, compliant and long-term development. It mainly relies on the automatic transaction system. The system provides independent website and background management, supports free setting and pricing of products, and transactions are directly credited. Qingyun I myself am doing primary school, kindergarten and other vertical fields, from direction selection to note production and account operation, comprehensive teaching to ensure that students master monetization skills. No technical difficulty, teaching from scratch, suitable for students of all levels.