The commandment not to steal and the prohibition of harm as an example

In honor of Rabbi Michael Shalom,

I am not familiar with the Gemara and Mishnah on the subject of relations between man and his fellow man (and in general). But from what I know and have read a little, it does not seem to me that it is written in the Mishnah or perhaps even in the Gemara about things that are a simplification of the Torah, such as that it is forbidden to steal or injure, but only the punishment and what is due in court.

A. Does this mean that there is a verse from the Torah’s plain text in the case where there is no explanation and ruling in the literature of the Sages (because the plain text is binding)? For example, is it clear from here (and from here in fact) that “You shall not murder” also applies to a Gentile and not, as they say in the “Torah of the King,” which only applies to Israel?

on. Does this teach about the order of study that a five-year-old should study the Bible, etc.? And if one wants to thoroughly understand the Torah’s commandment according to the Halachah, one should start with the Pentateuch? And should one then specifically start with the Prophet? Or should one continue with the Mekhilta and the Safri?

Thank you very much and have a good week!!