Hello, Quantum Physics is a topic that I didn't study in college, and, I do not know why, is calling my attention lately. Just to mention my background, I had 2 physics courses (mechanics and electromagnetism), and I used to study from Physics 1 and 2 by David Halliday, Robert Resnick, in early the 90s. Then, Siemens, the corporation that I used to work for, sent me to leadership courses, management courses, and stuff like that... to be honest with you, I am sick of those management topics... maybe, this is the main reason to come back to science. Despite the fact I am only an engineer. I've been reading some posts about QP and, followig the advices you mentioned, I decided to start with these books: 1. The Feynman Lectures on Physics (3 books): for review physics mechanic and start to learn about QM, and, 2. Quantum Mechanics by Leslie E. Ballentine, for a more specific study I do not want to bother the forum by repeating the same questions again and again, but, just to be sure, if you have any other idea or advice, I will be more than happy to receive that from you.