Tripitaka is a collection into which the Word of the Buddha is divided. They are the Vinaya, Sutra and Abhidhamma Pitakas. They teach the Dharma of realization which is comprised of the three higher trainings.
Contents of Sutra Pitaka
The Sutra Pitaka was amassed together as the discipline (vinaya), and the dhamma (the teachings of the Buddha which led to enlightenment) in five collections. There are five Nikayas of sutras:
1. Digha Nikaya, the "long" discourses.
2. Majjhima Nikaya, the "medium-length" discourses.
3. Samyutta Nikaya, the "clustered" discourses.
4. Anguttara Nikaya, the "gradual collection".
5. Khuddaka Nikaya, the "minor collection".
Digha Nikaya: This incorporates the Greater Discourse on the Foundations of Mindfulness, The Fruits of the Contemplative Life and The Buddha's Last Days. There are 34 extensive sutras in this Nikaya.
Majjhima Nikaya: This incorporates Shorter Exposition of Kamma, Mindfulness of Breathing, and Mindfulness of the Body. There are 152 medium-length sutras in this Nikaya.
Samyutta Nikaya: There are 2889 shorter sutras bunched together by subject in this Nikaya. Samyutta Nikaya is further divided into sections. Each section is again divided into chapters. These chapters, in turn, deal with a particular topic. Samyutta Nikaya is one of the texts through which one can easily learn the major tenets of Buddhism.
Anguttara Nikaya: These teachings are formatted numerically. It incorporates, according to the commentary's estimation, 9557 short sutras grouped by number, from ones to elevens.
Khuddaka Nikaya: This is a heterogeneous mix of preachings, doctrines and poetry, accredited to the Buddha and his disciples. The contents vary reasonably between editions. It is the fifth division of the Sutta Pitaka which is a wide-ranging collection of 15-18 books containing complete suttas, verses and smaller fragments of Dhamma teachings. This also contains stories of ghosts and also the entire Jataka tales, the stories of previous births of Gautam Buddha.