I'll admit I only took one ML course more than a decade ago, so I don't really know how LLMs work and how to train my own models etc. Could someone recommend a

I'll admit I only took one ML course more than a decade ago, so I don't really know how LLMs work and how to train my own models etc. Could someone recommend a starting point to start learning more (book, how-to-series etc) for someone with a non-AI software engineering background?