selection tools - How do I remove subdivision loops? - Blender Stack Exchange
Blender tutorial: advanced modeling
how do I remove those weird edges from the subdivision surface modifier, ctrl+r doesn't seem to work? (look at the small purple line) : r/blender
Crash Subdivision modifier with OnCage - User Feedback - Blender Developer Talk
Chocofur Subdivision Modeling Basics Techniques in Blender 2.79
How can I remove these sharp edges? Adding another loop cut just adds another sharp edge, and alters the shape. It's a cube with a bevel and subdivision surface modifier on Blender
modeling - How to remove a subdivision of a cube - Blender Stack Exchange
modeling - How to remove triangular edges that appear after subdivision - Blender Stack Exchange