Learn how to implement comment posting functionality in a Reddit app in this 17-minute tutorial video. Explore the process of using Retrofit for POST requests to the Reddit API, with demonstrations using Postman. Understand the required data model and see a live demonstration of successfully posting comments to Reddit. Follow along as the instructor tests the implementation, explains the comment object structure, and showcases the complete workflow from logging in to posting comments within the app. Gain insights into handling API responses, working with headers, and integrating the commenting feature into the existing Reddit app project.