Samadhi Pada: The first chapter provides a definition and the purpose of yoga. various approaches that can be used to achive the objectives of yoga are provides. it has 51 sutras. in sutra 2 of the first chapter, patanjali defined the yoga as
"Yoga is the restraint of the modifications of the mind-stuff"
– translation by Swami Vivekananda
Sadhana Pada: the second chapter contains the practical approach to achieveing the goals of yoga. In this chapter the author gives a description of the eight limbs of yoga called Ashtanga Yoga, which is how the yoga sutras, patanjali explains the two paths or the two forms of yoga kriya yoga and ashtanga
(Eightfold or Eight-limbed Yoga).
Ahimsa: Non-violence or not harming other beings