Curve Creation is a mix between vector graphics creation and editing. It can be used to create new paths, but already entered points can sbe selected and edited, too.
By clicking and dragging new curve points are created, simple clicking creates line points. By holding Ctrl (Windows) or Command (Mac OS) a new vector layer will be created. Holding Alt will create a new subpath in the active vector layer.
Close Path in the Tool Settings controls, whether a new path will be closed automatically or whether it will be open. If it isn't closed automatically, you can close it manually by holding Shift+Ctrl (Windows) or Shift+Command (Mac OS) on creating a new point.
If you double click an already selected vector point, its position can be modified numerically.
Editing points works the same way as in Edit Vector Points (see chapter 6.4.1).