A must read for STM32. Short review, I know, but it really is that good of a reference.
There are some grammar issues since the author is a native Italian speaker, but they are very few. I don't like to give 5 star reviews, but this is a must for STM32 devs. It'll keep you from using multiple references (blogs, forums, other books, etc). Instead, you'll use your selected μc's datasheet and this book.