What are the main tenets of the teachings of Martin Luther?

Martin Luther became the leader of the Reformation in the 16th century. He was engaged in the development of his own teaching for the citizens of Germany, which in the future became the basis for the development of Protestant movements in the world. Martin Luther’s ideas meant that a person is free to choose a religion according to his preference, he cannot be persuaded by others to a certain confession. Lutheranism had its own church with simplified and cheapened rituals. It has become an alternative for many Christians who disagree with the official church.