The document provides an introduction to basic Bible doctrines. It defines doctrine as teachings or instructions, and notes that Christian doctrine is found in the Bible, which is the final authority. It explains that doctrine should be studied so that Christians have assurance they are walking rightly with God, can identify false teachings, and speak God's word with confidence. False doctrine comes from man, Satan, or takes away from the fundamentals of the faith, so Christians must avoid teaching or spreading heresy. The study of theology helps systematically understand teachings about God by examining topics like the Bible, God, man, salvation, and eschatology.