What 2 principals became the heart of the protestant understanding of Christianity?

The two principal tenets that became central to Protestant understanding of Christianity are "sola scriptura" and "sola fide." "Sola scriptura," meaning "scripture alone," emphasizes the Bible as the sole authority for faith and practice, rejecting traditions not grounded in scripture. "Sola fide," meaning "faith alone," asserts that salvation comes through faith in Jesus Christ, rather than through works or rituals. These principles shaped the Reformation and differentiated Protestantism from Catholic teachings.