Virtue ethics, Deontology and Consequentialism are the "big three". A very TLDR version is: - Virtue ethics: instead of judging actions as good and bad, you s

Virtue ethics, Deontology and Consequentialism are the "big three". A very TLDR version is: - Virtue ethics: instead of judging actions as good and bad, you should strive to become a good person (as defined by some specific set of virtues, like kindness, honesty, etc). - Deontology: actions should be judged by a set of some fixed moral rules, for example "lying is always bad", even if you had good intentions. - Consequentialism: actions should be judged by their consequences, for example by how much total happiness they create (utilitarianism). Doing something bad if it would make life of many people better is ethical, because the created happiness is more than the created harm. In reality of course there are many other branches of them and the distinction is often not as obvious, and your personal views are probably somewhere in between. https://plato.stanford.edu https://plato.stanford.edu is an amazing resource if you want more in depth explanation of philosophical theories.