New to 3D printing, how can i print a test line before prints?

[TTVert]

Sorry is the skirt the dotted line or the purple? I believe either would be fine. I think i understand better now after some more reading. It seems you may be able to set a global printer config that will print a skirt around anything you print. With this particular printer it homes X/Y and then prints a glob, retracts and drags that bit of filament to prevent curling and cleansup any residue. Is this though process correct?
Thanks
Dave