 So you don't understand Move Auto Radius, not a problem. Move Auto Radius is like moving one edge loop at a time. If you hold Shift, you'll be able to slide up and down in perfect directions, but the farther away from where you click, the weaker the move is gonna be. And if you hold Alt, it will expand inside and out. Edge Loop Partial does the exact same thing, except as usual, if you click on a loop, the effect will stop when it reaches a point that is only connected to three edges. Hope that helps, and as always, I hope you have a fantastic day, and I'll see you around.