1 The number
The general rule is that the Bible contains 66 little books.
2 The authors
The first 39 books, inspired by Yahweh, were written in Hebrew, albeit Official Aramaic is found in the books of Ezra, Jeremiah, and Daniel.
3 Jewish literature
Aramaic is an ancient Semitic language closely related to Hebrew and was spoken by the Aramean people.
4 The differences between the Roman Catholic Church (RCC) and Jews
Some of the books the Jews were using along with their inspired books, so the RCC added them. This was an attempt by the RCC (Roman Catholic church) to unify their citizenry under one religion. It was in the early 300s CE or AD that Christianity was made a legal religion and for a time pagan persecution had subsided.
5 The last 27 books
The Bible, from Matthew to Revelation, was written in Greek. Hence, with the first 39 Hebrew-Aramaic books of the Holy Bible from Genesis to Malachi, combined with the 27 books of the Greek Scriptures, we have the Biblical canon of 66 books that make up our complete Bible.
6 The Roman Catholic church added books
The Bible after the early church established the listing of the inspired books, which was determined before 325Ad or CE, and most of those extra books we cannot confirm whether or not it was composed by known bible characters or contained a character that was named in two the Genealogies in the Gospels.
7 Community influences
The reason why the RCC included those extra books, was because some of them were popular to the general community of believers and Pagans readers also a few of the books discuss some of the 400-year histories of the people of Israel after the last Israeli prophet spoke. (See Which are the 66 books of the Bible, in the same order as listed in the book?)
8 Additions to the Holy writings
The Catholic and Mormon Churches have made uninspired additions to the Holy Writings. However, these added books do not belong in the original Bible Canon, the Divine Library.