There is a detailed , elaborated description of various yajnas in Veda and Upanishad.Sri Krishna says to Arjun, O Arjun please do practise them to attain liberation and mokhya. You can be released from karma bandhan.

Shri Krishna says O ARJUN the one who realizes the true wisdom through yajna and sadhna is liberated ultimately.But the rest who do not do any kind of yajna and sadhna will never be peaceful and happy in life.

There is a detailed description of pranayam, prana, apana, uddana, samana and vyana. A yogi practises the inhalation and exhalation of the breathing technology. It is completely scientific yet the correct practice can lead to samadhi. One must find the perfect guru to learn the pranayam exercise.

There are different ways of doing sadhna and meditation. Some people do fire offerings by offering havan and ghee. Some do charity. Some follow Rishi patanjali's way of raja yog. But ultimately the sadhak who controls his mind and senses and surrenders his duty to God is said to have done the highest yjna and purification.

A yogi practises the ashtanga yoga method of Rishi Patanjali to control the senses. There is an elaborate explanation of the eight path of patanjali yoga sutra.

There are five kind of fire offerings. They are Bhut yajna, Manusya yajna, Pitru yajna, Dev yajna and brahma yajna. The last two are mostly prtactised in monks and sanyasis.

A saint is pure, enlightened and bright like light. Every work he does is offered to God. The food he eats, his sleep , his duty almost everything is offered to the Almighty. It is offered to the Brahma.

One who controls mind and intellect both, makes himself detached from materialistic desire and only does the duty without expecting the result is actually free and liberated. he or she is not affected. But he has to take care of the body because body is the medium.