Hi all, first of all I'm sorry if I've posted my question on the wrong section, didn't know where I should post it, I thought this forum might be the right choice. I've recently graduated from high school and I'm highly interested in stuff about General relativity and Quantum mechanics and geometry, I have read linear algebra and except Eigenvalues I'm good at it, I also know some random stuff from Calculus and differential geometry like total differential, directional derivative, chain rule, Frenet frame and so forth. can i start reading about tensors? what do i have to do to get enough required knowledge to understand tensors, manifolds and things required to read the GR and fluid mechanics? I know my questions might be so general. so forgive my ignorance. any kind of help would be appreciated.