I used both Griffiths and Townsend’s books in undergrad QM classes, they complement each other nicely. It’s been awhile, but IIRC Griffiths starts off with a fo

I used both Griffiths and Townsend’s books in undergrad QM classes, they complement each other nicely. It’s been awhile, but IIRC Griffiths starts off with a focus on continuous wave functions while Townsend starts off with spin and discrete states. If you’re interested in quantum computing, spin is the most applicable place to start, as a qubit can be identically represented as a spin-1/2 particle. I wouldn’t recommend Sakurai (which someone else mentioned) if you’re just starting. It’s what I used in grad school, and doable depending on your math background and motivation, but not the easiest intro.