I am often asked to recommend textbooks for quantum mechanics (QM). The book adopted most widely is probably Griffiths. Here, instead of recommending or not recommending this book, I’d like to use Griffiths as an example, to share my view on “what we expect to learn” from a good textbook: in which sense Griffiths is such a good textbook, and what are the components that Griffiths lacks.
In short, Griffiths is a manual, or “Cookbook on Quantum Mechanics”. It’s extremely successful in this regard, but is lacking in many other aspects. If you use Griffiths, it’s important to also use other books to complement its shortcomings.
Here are the details: