Prakriti is the Gita's word for nature: the field of body, senses, mind and ego, along with the three gunas that color them. It is the world of change. Understanding prakriti is practical, because it helps explain why we feel pulled in some directions, why habits are hard to break and why willpower alone often fails.
Gita 7.4 and 13.6 describe the components of nature: the five elements, mind, intellect, ego and the senses and their objects. Recognize that your body, mind, intellect and ego belong to the changing field and are not your true self. Gita 5.14 says actions, doership and results arise from prakriti while the Self remains a detached witness, and Gita 13.20 says nature and the conscious self are both beginningless. Gita 18.40 says all embodied beings are conditioned by the gunas born of prakriti.
The Gita also gives guidance for working with nature. Gita 3.33 says every being is moved by its own nature, so lasting change comes from understanding and guiding it and not simple suppression. Gita 9.10 says nature works under the Lord's overseeing presence, and Gita 14.3 describes creation as arising from the union of the Divine, who gives the seed of consciousness, and prakriti, the great womb. See life as an expression of a larger order, and treat nature and all beings with respect and responsibility.