 So you don't understand the infinite radius, not a problem. Move brush infinite radius just means it will apply the full weight of the movement to the entire edge loop all around the object. Just the whole loop. Forget the camera, forget the brush radius, just moves the whole thing. As usual, you hold shift to slide across the surface and hold alt to expand inward and outward. Edge loop complete just grabs the whole loop. Edge loop partial does the same thing except when it comes to a point that's only connected to three edges and poly loop grabs the entire loop perpendicular to the edge you clicked. Hope that helps and as always hope you have a fantastic day and I'll see you around.