Please explain a vector can be shifted without changing its values its length and direction and not changed and displacement vectors represent only the overall effect of the motion but not the motion itself.

Vector, in physics, a quantity that has both magnitude and direction. It is typically represented by an arrow whose direction is the same as that of the quantity and whose length is proportional to the quantity?s magnitude. Although a vector has magnitude and direction, it does not have position. That is, as long as its length is not changed, a vector is not altered if it is displaced parallel to itself.
Hope it is cleared