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I will be writing a monograph about perturbation theory in quantum mechanics and I need help. My mathematics is not too notch, but I am working on it, plus I haven't finished QM yet, I'm working through Zetilli's book. I am doing bachelor's and I've found some resources but I really need a book that discusses perturbation theory (in QM) in details yet not very difficult to read just so I can get started.

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    $\begingroup$ A lot of people find David Griffiths' textbook beginner friendly, although every standard QM textbook will cover perturbation theory in some detail. $\endgroup$
    – Charlie
    Dec 22, 2020 at 15:37
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    $\begingroup$ I would suggest Griffiths' textbook, since it is the standard undergraduate textbook at many institutions, and I think it covers perturbation theory well. There are some online resources that are also helpful, such as this: web.mit.edu/6.732/www/new_appendices.pdf $\endgroup$
    – Yejus
    Dec 22, 2020 at 17:29

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