1, Understanding Letters: This is an introduction to letters, which mainly introduces the lattice forms of 26 English letters, as well as their pronunciation and writing methods.

2. Literacy: This is a text introducing literacy, which mainly introduces the basic principles of literacy and how to use literacy to recognize characters. It also introduces how to remember words with literacy and how to spell words with literacy.

3. Understanding Chinese Characters: This is an introductory book on Chinese characters, which mainly introduces the structure, writing method, pronunciation and significance of Chinese characters. It also introduces how to recognize Chinese characters by literacy and how to remember Chinese characters by literacy.