The Bhagavad-gita is Sri Krsna's discourse for souls looking for answers to the complexities of material life.
It would be simpler to just say that the Gita is for the devotees. While it is true that the Gita is especially appreciated by the devotees, Krsna's aim is to help all of those who are interested in liberation to become eligible. Connecting with Krsna in this way is called yoga.