sugestions needed, which books are suitable for beginners on wordpress???

Hello, this is my second post, i need help, i dont know if this is the place, i am a beginner with wordpress, and i need to know what would be best to start a theme, from scratch or make it fit an existing theme. i have 3 books “professional WordPress, design and development”,
“24 hs trainer wordpress” and “building online communities with drupal phpbb and wordpress”.

my question is for someone that have more experience on wordpress and touching files on themes or child themes.
what books would you suggest me with examples on how does it works wordpress themes and the different files on themes like functions.php and so on… as i am new with the development in this cms its hard for me to read too much technical documents without any examples.

Thanks in advance for your suggestions and replies.
Salutations Ramiro.