Hello everyone, I've been trying to study theoritical physics since a long time now. I've seen a bit of math(ODE, basics Algebra and analysis) and physics(Lagragian/Hamiltonian, Solid mechanics, optics) using free courses and youtubes videos. But i find it more hard now as there is no more courses (I've found at least) to keep goin'. So, I've been searching for some books and found many and I really dont what to choose. So, if someone can advice some good books about all fields of Theoritical physics, i want the most complete/well-known/used books it doesnt matter for me if the book is hard,i think i can use Google to understand more, and also which book of Mathematics choose, I've found 3 that many people talked about(Mathematical method of boas/Arfken/Riley) Which one should i get or should i get all three?! Do I need more books about mathematics or these three are enough. [/URL] Thanks :).