does anyone have any tips or know anything to read about using gpt-index and langchain together? i want to build langchain agents, but want the functionality of going over prompt limits and data strutures with gpt-index

hey guys! looking for some advice on how to approach using GPTIndex. My goal is for the platform to read files then generate content (summaries etc) based on the materials. what’s the best way of approaching this in terms of what structures / queries to use. Thanks!