Shri Yamunacharya, having learned the secrets of Bhagavad-Gita from a SadAcharya, has given us the essence of Gita in a nutshell in his Gitarthasangraha (32 stanzas). This gives the essence of Gita, all the eighteen chapters of Bhagavad-Gita. 

SvaDharma-jnana-vairAgya sAdhyaBaktyekaGocaraha !

nArAyaNah param brahma GiTaSastre samIritah !!

This first verse tells us the whole gist of Gita Sastra.

The subject matter of the Gita Sastra is Sriman Narayana, Sriman Narayana is Para Brahman. He pervades everywhere. He is Omnipresent. Omnipotent. He is our Antaryami too. He is well within this Jivatma.

Bhakti is the only way to reach Him. Lord Sriman Narayana is both Upaya (Means) and Upeya(Destination). We need to climb three steps to attain Bhakti. (BaktyekaGocaraha)

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We need to climb three steps to attain Bhakti.

(SvaDharma-jnana-vairAgya sAdhyaBakti)

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Bhakti is attainable only by

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• Practicing one's own prescribed duties as per vArna and Asrama                    - Karma yoga (Swadharma anushtanam) 

• The acquisition of true knowledge

              - The knowledge of the seshatvam (servitude) of the jivatma

• and by Vairagya

              - Desirelessness and Detachment from materialistic activities.

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With all these three we can get into practicing Bhakti yoga. By practicing Bhakti you, we can reach our destination, the lotus feet of Sriman Narayana.

All these are explained fully and clearly in Gita Sastra [Sameerita]

Gita has been addressed as Sastra because it speaks only the truth. (nArAyaNah param brahma)