Tree diagram is more used to classify a word. In fact, this is an exercise of classified thinking. After all, like a harp diagram, it is composed of subject category items. Just like a tree, the theme is roots, the categories are branches, and the items in each category are leaves. In the process of painting, we should write the theme first, then quantify the branches according to the category, and then write the category, just to distinguish the category from the project.

In classification, we need to make clear the classification standards, and the classification of categories should also conform to our scientific common sense. At the same time, each category cannot overlap, so each project should belong to only one category, and everything in the theme should be divided. The third is that the classification standards are not uniform and unique. It can be divided into multiple classification standards, but the determined classification standards should be implemented.

Classification is very common in our life and study, and it is widely used. For example, garbage sorting and recycling can be seen everywhere in life, sorting out everyone's belongings every day and placing supermarket shelves in categories, which have brought great convenience to our lives.

In learning, we can use it to sort out the classification of knowledge points, remember the classification of new words and explain the classification of some subject concepts, which can help us improve the efficiency of learning and make our learning very simple with the help of classification.