 So you don't understand unwelding, not a problem. Edge Unweld lets you separate edges from the object. If target is set to edge and you left click, you'll be able to start cutting out chunks of the object with the edges. If target is set to edge loop, it will separate the whole object by the loop. As usual, edge loop partial does the exact same thing, except if you click an edge that has points that are only connected to three edges, the effect will stop and polyloop will target the loop that is both perpendicular to the edge you clicked and closest to the point you clicked. Hope that helps and as always I hope you have a fantastic day and I'll see you around.