This document discusses key concepts from Kantian ethics including good will, duty, the categorical imperative, and its three formulations. It explains that good will is unconditionally good and our moral duty arises from respect for moral laws determined by the categorical imperative. The categorical imperative has three formulations: the universal law formulation which holds that an act is only morally right if its maxim could become a universal law; the formulation to treat people as ends which means respecting others' autonomy; and the kingdom of ends formulation which means allowing everyone to be treated as an end rather than a means to an end.