Comment by freefaler

There also good resources like: annas-archive, libgen, and the good old sci-hub.

For paper management Zotero + https://github.com/ethanwillis/zotero-scihub plugin makes browsing google scholar very efficient.

Also Calibre fulltext search with OCR-ed PDFs:

https://github.com/ocrmypdf/OCRmyPDF

makes learning a concept/finding test exercises even easier.

Soon a local LLM to "RAG retrieval on my library" might be the next step.