One of the first textbooks where i truly wished it would just go on and on.<br>Definitely helped my understanding, but it is only an introductory book that often scratches on the surface. Either way a good starting point and almost no prior-knowledge required.<br>Afterwards or as alternatives i can recommend (imo)<br>  - Symmetry and the Standard model by Matthew Robinson (sligthly more demanding)<br>  - Quantom theory, groups and representations by Peter Woit (a lot more demanding)