◇ Could this help me?
Yes for the curriculum, which is better chosen than most learning lists. The sequence is right: asking whether retrieval is still needed before learning retrieval is the correct first question and the one most courses skip, and ending on relevance and governance rather than on implementation is where the real difficulty lives, since a retrieval system that returns plausible but wrong passages is worse than none. The instructors named publish freely, so there is no reason to go through an intermediary to reach any of it. General practice, with one honest note: this is a pointer rather than teaching, so the value depends entirely on the linked material, and the specific videos should be verified as the ones described before time is committed.
Before I learn retrieval systems, help me work out whether I need one. For the material I describe below, tell me honestly whether it is small and stable enough to simply include in context, large enough to need retrieval, or unstructured enough that neither works well without restructuring it first. If retrieval is justified, explain in order: how basic retrieval works, what changes when the system decides for itself what to fetch next, and what graph-based approaches add. For each stage, tell me what fails in practice and how I would notice it failing, since a system returning confident wrong passages is the outcome I most want to avoid.