@silentheart00 Good star on your character’s head bust so far 👌 I relate to what you mean about Blender’s sculpting system being unintuitive at times. The way I think of subdivide edges is “subdivide” + “edges”, where subdivide suggests topology will auto generate and “edges” means that edges can be maintained. Subdivide collapses is the same meaning of subdivide, but “collapse” suggests edges aren’t maintained and geometry will perpetually collapse based on your detail size.
Hope that helps at least for those settings.