1.question pivot point
how can i place it to another place?
when i move the vertex points of an object, the pivot of the object doesn´t change its position.
but now i want the pivot to place it accurately to the position of a vertex-point?

2.question vertex points
how can i move them in a accurate way, for example, 0.05 units in y-direction?

3.question alignement
how can i align an object to another one?