I assume the baseline here is interpretation of and principals behind understanding the 66 book Protestant canon.
What about the extra 7 Deuterocanonical books used by Catholics?
What about the extra 12 used by the Eastern Orthodox church?
What about other ancient Jewish literature considered of import to understanding the Canon(s)?
What about other Apocryphal NT works such as the Gnostic gospels?
What about other texts used by some sects such as the Pearl of Great Price used by LDS?
What about the Qur'an?
Obviously somewhere along this line the scope changes from being "Biblical" to being general hermeneutics on religious texts. Where is that line to be drawn for the scope of this site?