I'm looking for less of a recommendation on resources for a specific topic, and more for a general path of what to learn to get to a certain topic. If there's a better place to ask this or tag to use, let me know - I couldn't think of anything better.
I want to learn about the holographic principle and related concepts, in all its mathematical rigor. Now, before I am ridiculed on how large a task this is, I admit - it's probably unfeasible. But the value is in the journey; even if I don't make it that far, I'd love to know plenty of stuff on the way.
Problem is, I have no clue how to tackle it. Where I'm currently at, I know a decent bit of undergraduate mathematics and physics, and I have a vague idea that learning GR might be a good step. But ideally, I really need a path forward, what topics to learn to get from here to there.
Once again, if I'm asking in the wrong place, let me know if you know a better one.