Thanks for the thread ratikala!
For the purposes of comprehensiveness, I'll also reproduce Patanjali's Yamas and Niyamas, of which there are five each. He taught that being established in these was necessary for advancement in raja yoga, the path to union with God through meditation.
Yama
Ahimsa - non-violence, in thought, word and deed. First and foremost, quite rightly.
Satya - truthfulness, honesty. With yourself, with others. Integrity.
Asteya - non-stealing, non-coveting. Extends to not taking more than you need, not taking resources selfishly. Sustain yourself healthily and simply
Brahmacharya - includes celibacy (thought, word and deed) but includes also continence and appropriate use of your energy anyway - don't become scattered by always multitasking etc.
Aparigraha - non-jealousy, non-covetousness.
Niyama
Shaucha - cleanliness - aiming to keep yourself clean in body - not necessarily in terms of dirt etc, but in terms of health, flow of energy (many yogi sadhus are very dirty, by appearances
) and then also in your subtle body. Shaucha is said to lead to disdain for the body!
Santosha - satisfaction, being content with what you're provided.
Tapas - discipline, related to the word for burning or fire - tapas is burning austerity borne from gradually leaving aside all desire but for the divine. Earlier on, it can start with saying 'I will meditate for 10 minutes a day
'
Svadhyaya - study of the scriptures, and of the self. So both introspection and contemplation upon teachings from the Vedas, the BG, the Yoga Sutras, the Ashtavakra Gita, writings and sayings of sages such as Shankara and Ramana, as you like.
Ishvarapranidhana - surrender of the self to the Lord.
As you explore these, they very much dovetail together - e.g. surrendering to the Lord (Ishvarapranidhana) is very purifying (Shaucha) and includes being content with what you're given (Santosha)
Swami Satchidananda said that actually if you were to really perfect even any one of these ten, then you would attain to moksha. So really Patanjali seems to have been saying we need to establish ourselves in these and then go deeper into them as we progress into the other six limbs of his practices.
Asana - physical posture
Pranayama - breath control
Pratyahara - withdrawal of senses from objects
Dharana - one-pointedness of mind
Dhyana - flowing meditation
Samadhi - union, a state deep within meditation where there is no longer any subject-object division.