No charge. After asking about this brand store, I learned that books that are free of charge during the training period also burn grass. Book burning grass is a brand belonging to the catering industry. Its founder is Wang Bin. "Books also burn grass" is a famous local brand in Sichuan Province. It was born in 2007, and 12 years has been focusing on the herbal tea industry. It advocates a "fresh, healthy and fashionable" tea culture of Xiancao, and advocates making it easier to start a business and making the world fall in love with Xiancao tea.