How to create a vertex on a parallel edge? I'm having this structure:

I would like to create a vertex where the arrow points to. This is the opposite of an existing vertex on the right edge, so just shifted a bit along y to the left.
Select the edge (as you did in the screenshot), press RMB &gt; Subdivide. Hit 1 to enter Vertex Edit Mode. Select the new vertex, double-tap G to move the vertex along the edge with Vertex Slide.