May as well ask here: what is the best way to use something like an LLM as a personal knowledge base?

I have a few thousand book, papers and articles collected over the last decade. And while I have meticulously categorised them for fast lookup, it's getting harder and harder to search for the desired info, especially in categories which I might not have explored recently.

I do have a 4070 (12 GB VRAM), so I thought that LLMs might be a solutions. But trying to figure out the whats and hows hase proven to be extremely complicated, what with deluge of techniques (fine-tuning, RAG, quantisation) that might not might not be obsolete, too many grifters hawking their own startups with thin wrappers, and a general sense that the "new shiny object" is prioritised more than actual stable solutions to real problems.