In some of my Blender files there are unneeded / useless vertices. The screenshot shows this:
The vertex is not needed. Is there a way to search the model to find such vertices?
This section relates to the answer given below which is is a good solution.
I simulated a poor 3d model as show in the picture (The selected vertex is the culprit I am looking for)
Simply using Shift + G > Amount of connecting edges locates the poor vertex
The area around it is not selected, so it stands out. In this case I would manually delete the vertex and re-connect the vertices together in the surrounding area to fix this problematic area.