what resources (books, article series, online courses, anything else) would you recommend for a summary of strategies on how to build a RAG system? I am looking for some tips on how to decide on best way to index content, what querying strategy to choose, how to incorporate user feedback etc - all necessary parts of working RAG. I am in process of building a RAG system of my own, but it very often feels like I am trying to reinvent the wheel (even when using llama-index, which has been a tremendous help) and I am curious to learn what folks here have been using to get ahead. any tips will be very much appreciated
