There are mainly paid apps such as Hong En English (now renamed Hong En ABC), Hong En Mathematics (now renamed Hong En Thinking), Hong En Pinyin and Hong En Literacy. Offline mainly focuses on textbooks and learning materials. Hong En's online course service is mainly based on paid content in its application. Taking Hong En Literacy and Hong En Agricultural Bank as examples, according to the services provided in the APP of June 2002 1 8/day, the literacy services in Hong En mainly include literacy and reading.

Mathematical theorems, formulas, laws, etc. We should complement each other in recitation and understanding, and remember on the basis of understanding and comprehension. With these tools and our quick thinking, we can solve math problems with ease. The stronger the self-study ability, the higher the understanding. With the growth of students, their dependence on teachers is gradually weakened, and their self-learning ability is constantly enhanced. Therefore, to form a good habit is to preview the new lesson before the teacher talks about it. See if we can deduce new formulas or theorems and understand new contents through the knowledge we have mastered.