A few comments have been kind enough to recommend the textbook I wrote with Ike Chuang. I'm glad they find it useful!
It's worth noting: the book assumes a fair bit of mathematical background, especially in linear algebra. If you don't have the equivalent of an undergrad CS/math/physics degree (with some linear algebra), it may be better to start with gentler sources.
One such gentler source is the free online text I wrote with Andy Matuschak -- https://quantum.country. I'm sure there are others which are very good, but perhaps that's helpful!
Both books focus on foundations of the field, and don't cover recent innovations -- the book with Ike Chuang is 26 years old! Still, many of the foundations have remained quite stable.
Timothy Chow has a wonderful phrase for this - he describes one of his papers (on forcing) as solving an "open expository problem": https://timothychow.net/forcing.pdf