Oh god the way I learn is so scattered I don’t even know. I think I just started peeling the onion on Lie Group, lie algebras, representation theory (woits book is really good). Once you realize that so much of physics is based on irreducible representations of symmetry groups things start getting really interesting. Understanding what SO(2), SU(2), means, how it relates to quantum observables, pauli matrices, etc… so much to explore. Chatgpt helps a lot, it’s an infinitely patient tutor.