Is there any tutorial on good practices on how to chat with pdf with slides using llamaindex? The slides might have tables, infographics etc? How should I ingest them, with what models, what tools?

I am very new to llamaindex, where to start for a

1. Making a chain of LLM calls with loops
2. deploying and seeing how it behaves with multiple requests in the same time

Could you please indicate the core concepts/docs that would help me?