am i doing something different because when i snap verts to the grid all i do is hold x and then move them. is that different than cntrl x?

also, when you snap an object, doesnt it snap wherever the pivot is at? so it doesnt neccesarily snap at the edge. i believe you have to move the pivot. i know how to move the pivot, but how do you move the pivot to the edge of the object? when moving it, do you just have to eyeball it or is there a way to snap it to the edge of an object?

sorry if im hijacking someone's post.