Since you haven’t used GH it can be pretty daunting. But it’s powerful.
To make this simple definition without doing much research you can double click on the canvas of grasshopper to bring up a bar to type in. Type “Curve”, “Area”, “Point” individually to bring up those components .
Right click on curve and “set Multiple Curves” then select curves in your Rhino window (You may not have to duplicate the edge as I did).
Left click & drag from the right side of a component to the left side of the one you want to connect to.
Once you have that you can right click on “Point” and click “bake” to create geometry in Rhino.