Goal 2 animation: you want the heads of the base bone aligned to the bottom of the wiper base. Then the tail of the base bone and the head of the arm bone you want at the pivot point of the arm. The center of the rounded part of arm that attaches to the top of the base. The tail of arm bone needed to be positioned so that the axis you want(x, y, or z) of the bone points/follows the normal of the rounded area of the arm. This will become the axis you rotate the wiper with. Technically you don’t need a root bone, but it’s common to have one. Also if you decide to add a truck bone then the root bone would be used to move both the truck and wiper.
