To draw graphs in Obsidian, we can use Mermaid, which built-in and great for flowcharts. Mermaid is a simple markup language for creating diagrams from text. Here is a simple flowchart:
graph TD; A-->B; A-->C; B-->D; C-->D;
and here is the syntax:
```mermaid
graph TD;
A-->B;
A-->C;
B-->D;
C-->D;