The Five Solas: Sola Scriptura, Sola Fida, Sola Gratia, Solus Christus, and Soli Deo Gloria. As such we believe that all truth comes from scripture, and that all truth must agree with scripture. Any "truth" that does not agree with, but instead contradicts scripture, is not truth but instead a lie.
The Doctrines of Grace (aka TULIP): Total depavity, Unconditional election, Limited atonement, Irresistible grace, and Perseverance of the saints. As such we believe that apart from God's direct interaction with us, we cannot and will not be saved. Furthermore, we believe that one cannot earn or work their way to either salvation or to heaven.