Is there a difference of in which and where in vs. what of us who are on planet earth? Where in the following example:

However, this pros, is limited for the articles where an edge resides perpendicular to the ridge-line and connects via two other edges.

I feel I should use which instead of where.

What are grammatical errors? Are they both harmful?

What is the answer to answering the first question always, and finally, what are you gonna do?