The three parts of the Vinaya (rules for monastics):
1. Suttavibhanga: the basic rules of conduct (Patimokkha) for bhikkhus and bhikkhunis, along with the origin story/reason for each one.
2. Khandhaka:(i) Mahavagga: rules of conduct and etiquette and historical information. (ii) Cullavagga: elaboration of etiquette and duties and rules and procedures.
3. Parivara: summaries