I know that conservative forces conserve mechanical energy and non-conservative forces do not conserve mechanical energy and that for conservative forces a potential energy $PE$ can be defined while for non conservative force a potential energy cannot be defined since the work done is independent of the path taken in the first case and in the second case the work done is dependent on the path taken and hence the energy transfer in both the cases, i.e., for conservative forces,
$$W=-\Delta PE$$
Now i am really messing up conservative forces, the equation $W=-\Delta PE$, and non-conservative forces.
Does this equation mean that conservative forces can change only the potential energy of a body and that non-conservative forces can change only the kinetic of the body or the opposite or that both conservative and non-conservative forces change both the kinetic and potential energy of the body?