I am not a developer, I'm more into design, but I am looking to improve my skills in Html/CSS. I stumbled upon this book and I loved it! It is simple, packed with tips but easily understandable for those like me who know next to nothing about programming.
There are sections about history, about code conventions, about what to study and what not to, about looking for a job in development etc. It is not a very long book but it's better like this, too long would have been too many information while it is more focused this way. There are different authors and the style can vary a bit from chapter to chapter. Overall I feel like I learned a lot from it and am more prepared to learn more about programming.