He got caught in a storm and prayed to God. His promise to God was to become a monk
Luther believed in justification by faith. He saw John Tetzel collecting indulgences and was angered.
Nailed 95 theses to the door of Wittenberg University.
Emperor of Germany invited him to the diet of worms to let Luther explain himself. Declared Luther as an outlaw by the edict of worms and anyone could kill him.
Luther was able to stay at Prince Fredrick the wise's castle and during his stay he translated the bible from Latin to German which let others read it and he gained more followers. These copies were easily accessed thanks to the printing press.