There are roughly three kinds of English enlightenment textbooks: (1) unified textbooks used by schools; (2) Textbooks jointly compiled by English teaching experts at home and abroad (such as Cambridge Children's English); (3) Training institutions independently develop teaching materials. I know an online English training institution that uses self-developed textbooks. TomABC's textbooks refer to mature English textbooks such as Pearson, Oxford and Cambridge, and then refer to European standards combined with national standards to develop a set of English textbooks that meet the needs of children in China, and are also specially designed for zero-based babies aged 3-6.