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Now I want to continue learning QFT and also I want to make a second read of the contents of the first course and I'm quite confused which book to pick.

There are no other QFT courses in the university, so that taking a more advanced second course isn't an option.

Now I confess that there are a few topics that in the way that Schwartz explained, I didn't really get it. Schwartz does a quite good job in teaching how to compute things, but there are a few things that I want to really understand a little better the underlying reason. One example of this is what Schwartz calls the "embedding of particles into fields". For me his explanation is highly confusing and handwavy.

Now it seems that Weinberg's book is actualy considered the best one (he expends one whole chapter to explain this embedding of particles into fields stuff). But I don't know why, I feel Weinberg's book extremely hard. I've tried a few times to go over it. It took me days to progress just a little and in the end I gave up.

So what are other books than Weinberg's that I can pick, considering I have already a one semestre course in QFT following Schwartz? I want both to review what I've seem and to progress in QFT further (learn path integrals, non-abelian gauge theories, etc).