At the expense of over-simplification, here is a schematic diagram, just to recap the previous chapters and make room for the things coming up in next chapter. Krishna says - one understands this field through
Samttva Buddhi Yoga , also sometimes refrred to as
Nyaan Yoga but one must work hard on righteous actions
Karm Yoga to get ever lasting peace and finally the exit.
Idam Shariram Konteya, Kshetram Iti Abhidheeyte ; Etad Yo Vetti Tam Prahuh, Kshetra-jna Iti Tad-vidah | [13.2]
This body is known as the field. One he sees it that way, is the knower of the "Field"