Review of A quantum mechanics primer powered by the Slant community.
This book is the classic resource for getting started in Quantum Mechanics. Although over 40 years old the content is still very relevant and is the perfect introduction to Quantum Mechanics for those with no background in the subject.
Gillespie's short book is a model of clarity, explaining the big ideas, explaining what is a assumed (postulate) and what is derived (theorem), and tying the diverse threads of this subject into a beautiful and powerful whole.