Building a free, offline LLM “tutor” grounded in one university textbook — RAG, LoRA, or both? Sanity check wanted

Hey everyone, looking for a sanity check before I commit to an architecture. The goal: a free, fully offline study assistant that runs on a student’s laptop and acts as a tutor for one specific textbook. Not an expert system — more a patient TA that “speaks the language of the book,” answers in its