In this article entitled "Does your discussion realize its potential?", Dr. Lorelei Lingard effectively summarizes the goal of a discussion. Together with the introduction, the discussion section of your paper helps to outline the story of your paper.
Dedhia J, Mukherjee E, Mehta N, Pawar AM. The Art of Writing a Scientific Research Paper-A Guide to Beginners. J Cont Med A Dent. 2017;5:11-8. Read it here