How to create rectangular Curves for Bevelling| Blender 2.9 | Tutorial

25games writes:

The Bevel function on curves is a very useful tool for creating a specific shape along a bezier curve in Blender 2.9 – So far I talked about round shapes but what is with rectangular curves? Sound strange but is very easy and cool!
In this video I will give you a quick overview of my first video (and the link if it would be interesting for you) and how to create rectangular custom shapes for bevel or as the bevel object.