Blender as a CAD tool: How to find edge intersections?

Allan Brito writes:

Have you ever tried to use Blender as a CAD tool? Many people have this misconception about Blender as a 3D tool that can’t manage or do precise 3D work, but with the right tools and resources you can do a lot of CAD-like work.

In this tutorial, I explore different ways to manage a common type of CAD interaction: finding edge intersections.