Follow what has been advocated to you by your Guru. That would suffice. There is no need for any kind of study.

Nama Article 12^th Jun 2016

You advocate chanting of 'Hare Rama Mahamantra'. Someone else propagates chanting of 'Rama Rama', another 'Ramakrishnahari' while yet another advocates chanting of 'Sri Ram Jaya Ram Jaya Jaya Ram'.

HH Maharanyam Sri Sri Muralidhara Swamiji

You approach a doctor for relief for your ailment. He tells you, "Haemoglobin count has gone down in your body. Therefore, add carrot or red radish or beetroot or apple or tomato to your diet." Why didn't the doctor advice taking just one of these? In the world, tastes of people differ. Follow what has been advocated to you by your Guru. That would suffice. There is no need for any kind of study.

Chant the Mahamantra Nama kirtan :

Hare Rama Hare Rama Rama Rama Hare Hare
Hare Krishna Hare Krishna Krishna Krishna Hare Hare