Here is a really interesting article by Rabbi Eliezer Melamed. I am not saying I always agree with his own analysis, but rather that the sources brought are central and deserve to be studied.
OK. But what’s the topic?
Hard to give just one answer: “Dina demalchusa dina“, the exceptions thereof, the possible reasons for this rule, how come Jewish wars don’t violate “Pikuach Nefesh”, living in and settling Israel, Lo Sechanem and Mesirah, destroying Jewish homes, God forbid, and more.
See it here.