Karpathys stuff (https://karpathy.ai/zero-to-hero.html) is a pretty good overall intro. But for the hero part, you aren't going to get that from any course material, you are going to get it from implementing and training said models, which is somewhat unfeasible due to the hardware required to train these at scale.
https://ig.ft.com/generative-ai/
https://www.coursera.org/learn/generative-ai-with-llms
NanoGPT on github
https://github.com/samvher/bert-for-laptops/blob/main/BERT_f...