You’ll have to look into a few core ideas of Catholicism for the answer, the early church fathers, what they taught in regards to tradition, the liturgy and the Mass, the early Church and community, being guided by the Holy Spirit, all of which predate the Bible, the 73 book Bible canon didn’t official exist until 382 Council of Rome. - it’s a Catholic (and Orthodox since they were the same thing then) book.
Said in another way, with out a deep history of all the intertwined teachings and traditions and writings that continue without break after the death of the death of the apostles you’ll struggle with most things related to the faith, because it’s all one unbroken apostolic teaching guided by the Holy Spirit, in the Church. Finally looking into the magisterium would be the last key.