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### Textbook on group theory to be able to start QFT [duplicate]

I am very enthusiastic about learning QFT. How much group theory would I need to master? Please could you recommend me a textbook on group theory, which would help me to start QFT?
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### Symmetry and group theory book [duplicate]

I would like to start learning about symmetries in physics and how they affect physical quantities. As far as I know, the mathematical language that describes symmetries is the Group Theory. So, I ...
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### Textbook on group theory [duplicate]

Can you recommend me a good textbook on group theory? I am interested in particular in tensor representation of a group, e.g. why $3 \otimes 3 = 6 \oplus \bar 3$ for $\rm SU(3)$. Is there any ...