Book suggestion for Tensor Calculus (Differential geometry)
I have studied Multi-variable calculus. Now, I am thinking to study Tensor calculus. As it is an important topic in General Relativity. I have found a book called (Mathematical Methods in Physics: Distributions, Hilbert Space Operators, Variational Methods, and). Should I read that book? I want to learn Math tools. And, is there something I should read before studying Tensor Calculus?