The website provides thousands of graded books for children to learn to read, of which we are more familiar with and commonly used Leveledreaders from aa, a to z 27 levels of difficulty, each level has more than 20 books, spanning Pre-K to Grade-5. (aa minimum level, suitable for kindergarten children; z highest level, suitable for 4-15 years old children, especially for domestic primary and secondary school students) Its content covers a wide range of: common sense, astronomy, geography, history, fairy tales, humanities, animals and plants.
decodable books (decodable books), that is, simple self-reading books written by Phonics rules to train children's phonics ability.
Decoding refers to \"phonological decoding\