What is mathematics books need to read to well understand Quantum Field Theory of Weinberg Vol 1,2,3?Please hint me some group theory books?I know not much in representation of group.
If you're interested in representation theory, then you can't really do better than Hall: https://www.amazon.com/dp/0387401229/?tag=pfamazon01-20
Do not get an abstract algebra book. Those books focus a lot on finite groups, which are things which you won't need for QFT.