"The career of a young theoretical physicist consists of treating the harmonic oscillator in ever-increasing levels of abstraction."
      -- Sidney Coleman. 

It is totally worth giving a look at the following website for doing some independent study on QFT

Lectures on Quantum Field Theory- David Tong

Note: Let me warn you here, that the subject matter discussed here is highly technical and that undergraduate physics is strictly required to follow up the course.

I hope this helps.

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