2. Decide the branching direction of mind map according to the branching amount. Just draw the numbers of the four branches clockwise, and then mark them with serial numbers.
3. After drawing the main branch, if there are subdivision branches, continue to grow subdivision branches along the main branch and mark the serial number in turn. The place circled in red in the picture below.
4. The order of subdivision branches is marked from top to bottom, and the writing is from left to right. The direction indicated by the arrow in the figure below refers to the writing direction of the sequence and text labels.