The Bhagavad Gita is what is called a moksha shastra, a scripture dealing with moksha. See all the external activities, pursuits to get happiness from something outside are broadly classified under three heads. We pursue pleasure because we think that is what is going to give us happiness. Another way is through acquiring worldly power and achievement and status. And beyond that there is another word dharma. It means morality, decency, it means religion, all of that dharma. But specifically it means all the good that we do in a wider sense. In the Vedantic framework this dharma generates good karma for us, good results for us.