How to edit objects together I understand that the green lines are groups,is there a way to edit them all together,or to ungroup them and then regroup them all into a single object?

This is what happens when I enter edit mode:

My goal is to be able to edit all of the green lines together so that I can fill the gaps in between them like this:


I'm sorry if I didn't explain the issue correctly,I'm a beginner and this is the first time that I ask something.
Select the objects in object mode, then press Ctrl+J. They are now merged into a single object.

Since these are curve type object, connecting them with faces is not that easy. I would suggest that you convert your new object to a mesh. Alt+C > Mesh from Curve/Meta/Text