1. Open GitMind and click New to enter the brain map editing page.

2. Click the theme button on the left and choose your favorite theme style. 3. In the new mathematical mind map, click Layout and select your favorite mind map layout. 4. Double-click the center node, enter "the fifth grade math volume", and press the Tab key to add a branch topic. 5. Enter the first cell to the eighth cell in the branch node in turn, and click the text to modify the color, size, background, etc. 6. After the production is completed, click Export or Share in the upper right corner.