I'll try to help you understand:
''Hebrew Bible, collection of writings that was first compiled and preserved as the sacred books of the
Jewish people. It also
constitutes a large portion of the
Christian Bible, known as the
Old Testament. Except for a few passages in
Aramaic, appearing mainly in the
apocalyptic Book of Daniel, these scriptures were written originally in
Hebrew during the period from 1200 to 100 bce. The Hebrew Bible probably reached its current form about the 2nd century ce.''
https://www.britannica.com/topic/Hebrew-Bible/Books-of-the-Hebrew-Bible
Jew, any person whose
religion is
Judaism. In the broader sense of the term, a Jew is any person belonging to the worldwide group that
constitutes, through descent or conversion, a continuation of the ancient Jewish people, who were themselves descendants of the
Hebrews of the
Bible (
Old Testament).
In ancient times, a Yĕhūdhī was originally a member of Judah—i.e., either of the
tribe of Judah (one of the 12 tribes that took possession of the Promised Land) or of the subsequent Kingdom of Judah (in contrast to the rival
Kingdom of Israel to the north).
The Jewish people as a whole, initially called Hebrews (ʿIvrim), were known as
Israelites (Yisreʾelim) from the time of their entrance into the Holy Land to the end of the
Babylonian Exile (538 bce).
Thereafter, the term Yĕhūdhī (Latin: Judaeus; French: Juif; German: Jude; and English: Jew) was used to signify all adherents of
Judaism, because the survivors of the Exile (former inhabitants of the Kingdom of Judah) were the only Israelites who had retained their distinctive identity. (The 10 tribes of the northern kingdom of Israel had been dispersed after the
Assyrian conquest of 721 bce and were gradually
assimilated by other peoples.)
The term
Jew is thus derived through the
Latin Judaeus and the Greek
Ioudaios from the
Hebrew Yĕhūdhī.
The latter term is an
adjective occurring only in the later parts of the
Hebrew Bible and signifying a descendant of Yehudhah (Judah), the fourth son of
Jacob, whose tribe, together with that of his half brother
Benjamin,
constituted the Kingdom of Judah.''
https://www.britannica.com/topic/Jew-people
