Ramana MaharshiIf one wants to be saved, one is given the following true and essential advice: just as the tortoise draws all its five limbs within its shell, so one should draw the five senses within and turn one’s mind Selfward. This alone is happiness.

Ramana Maharshi

Jñāna Yoga
Path of Knowledge
(Also called brahmavidyā or jñāna-kāṇḍa, found in last section of Vedas - being the Upaniṣads)

Recommended method of starting with Jñāna Yoga is to refer to the beginning sections of explanatory texts (prakaraṇa granthās) like:

References: