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;