Some clarification on the terms. (H) means it’s a Hebrew term, (G) means it’s Greek, (L) means it’s Latin.
Torah (H) / Pentateuch (G) - the first five books of the Bible; Genesis, Exodus, Leviticus, Numbers, Deuteronomy.
Old Testament (L) / Tanakh (H) / Hebrew Bible - the entire Old Testament.
LXX (G) / Septuagint (G) - a specific Koine Greek translation of the Old Testament, that was used by Jews during the time of Christ. Whenever the Gospels or Epistles quote the Old Testament, they are using the Septuagint.
Masoretic text (H) - the Hebrew text that is currently accepted by Jews and many Protestants as being the “official” text of the Old Testament. (Catholics and most Eastern Orthodox generally say that there is no “official” text of the Old Testament and are open to comparing and synthesizing both Greek and Hebrew manuscripts to make a critical text or translation.)