https://www.youtube.com/@LangChain/playlists
https://python.langchain.com/docs/introduction/
https://python.langchain.com/v0.1/docs/get_started/quickstart/
https://www.youtube.com/watch?v=-xkduCeudgY
https://www.youtube.com/watch?v=bq1Plo2RhYI
https://github.com/langchain-ai/rag-from-scratch
https://www.youtube.com/watch?v=6t7YJcEFUIY