A Daf Yomi Shi'ur that I listen to went into details about Hechsher Mitzvah when we reached Yevamoth 6a. Essentially, Rashi says that the Gemara's term, "Hechsher Mitzvah", is referring to a scenario ...
A deleted post from a long time ago made the claim that [W]e are [allowed to charge interest to other Jews] but not from immediate family. Even from another Jew, if he or she is not a member ...
There's a fairly commonly quoted idea in נזיקין masechtos, that a difference exists between דיני ממונות (monetary cases) and דיני נפשות (capital cases); that by דיני ממונות the חייב [whoever is חייב] ...