For the love of God, do not use Shankar!<p>The book is just down right atrocious. The fact that it became almost standard in American universities speaks more of the power of networking than anything else. Shankar&#x27;s book is anything but rigorous, quite on the contrary.<p>There are so many good QM books:<p>For an absolute beginner I&#x27;d recommend David Griffiths<p>Dirac&#x27;s is very readable<p>Sakurai&#x27;s is very good though a bit advanced<p>Whatever you do, it&#x27;s difficult to go wrong by not using Shankar&#x27;s