The steps are as follows:
1. Draw leaves on green paper with a green pen. Draw a leaf diagram according to the number of directory titles of mathematics courses, as shown in the figure below.
2. Write down the titles of mathematical knowledge points on green paper with a blue pen. Note that the text should be written in the middle, so it looks better, as shown below.
3. Cut off the leaves on the green colored paper with scissors, as shown in the figure below.
4. Draw trunks and branches on white paper with brown markers, and write down the theme of the tree of knowledge with blue markers. Note that the subject text is written vertically, as shown in the figure below.
5. Put the cut leaves on the trunk and branches. Pay attention to the placement of leaf graphics. According to the learning order of mathematical knowledge points and the relationship between knowledge points, the leaf graphics are beautifully placed, as shown in the figure below.
6. Draw a sketch with a pencil according to the placed wisdom tree, and color the leaves with a green marker, as shown below.
7. Color the trunk and branches on green paper with a brown pen, as shown in the figure below.
8. Write down the titles of knowledge points on the leaves and the theme of the tree of wisdom on the trunk with blue colored pens, thus drawing a beautiful and practical tree of wisdom for learning mathematical knowledge.