It is regarded to be "the best" book on the topic by many. I found just like what Giles Thomas wrote that the book focuses on the details and how to write the lower level code without providing the big picture.

I am personally not very interested in that as these details are likely to change rather quickly while the principles of LLMs and transformers will probably remain relevant for many years.

I have been looking for, but failed, to find a good resource that approaches it the way 3blue1brown [1] explains it but then go deeper from there.

The blog series from Giles seem to take the book and add the background to the details.

[1] https://m.youtube.com/watch?v=wjZofJX0v4M