It sounds like you want more broad stuff, not necessarily learning how to train models. More like learning to use them and how they work.

https://news.ycombinator.com/item?id=36195527 and

Hacker's Guide to LLMs by Jeremy from Fast.ai - https://www.youtube.com/watch?v=jkrNMKz9pWU

State of GPT by Karpathy - https://www.youtube.com/watch?v=bZQun8Y4L2A

LLMs by 3b1b - https://www.youtube.com/watch?v=LPZh9BOjkQs

Visualizing transformers by 3b1b - https://www.youtube.com/watch?v=KJtZARuO3JY

How ChatGPT trained - https://www.youtube.com/watch?v=VPRSBzXzavo

AI in a nutshell - https://www.youtube.com/watch?v=2IK3DFHRFfw

How Carlini uses LLMs - https://nicholas.carlini.com/writing/2024/how-i-use-ai.html

For staying updated:

X/Twitter & Bluesky. Go and follow people that work at OpenAI, Anthropic, Google DeepMind, and xAI.

Podcasts: No Priors, Generally Intelligent, Dwarkesh Patel, Sequoia's "Training Data"