What are the best resources to learn how to build LLMs from scratch for 17 year olds?

I have my opinion on this but I'd like to hear the HN opinion, I will just say one thing:

If you are starting with little knowledge, like a 17 year old would, letting an LLM explain it to you is a terrible idea.

Andrej Karpathy has a great Youtube series on how to build LLMs from scratch. Perfect for somebody who just learned a lot of high school math. Would start there and get busy with some handson python coding.