
Blender Secrets is home to hundreds of one-minute or less video tutorials that teach you specific topics. The Trim Curve node shortens each spline in the curve by removing sections at the start and end of each spline. You could then add a round bevel and it would turn into a donut-like shape.

This could be helpful for any situation where you would want to create a closed curve.

Curve Edit Mode tools: Select Select or move. As mentioned above, to convert a curve to mesh you can use the mouse’s right click menu, select convert and mesh. To open a closed curve at the press Alt + C again.
