Hello,   I think you could begin with Ubuntu documentation , or you may want to check The Linux

Hello,

I think you could begin with Ubuntu documentation , or you may want to check The Linux Documentation Project . I don't know if there is a "good book", I'm sure there are, but you can appreciate a book as good or bad depending on your level compared to that book. I think you should try google for linux documentation and chose what's good for you.

Regards,
Alex