Hardware manuals/books

Is there any book or manual that can help me understand the significance and use of the components on the arduino uno board ? I would really like to know everything about them so that I can follow the tutorials available without knowing what I am doing...

What do you mean with:

significance and use of the components on the arduino uno board

There is a book from one member of the forum that I think (only from the TOC because I don't have it), that is a very good book to understand basic electronics. I don't know I is this what you're looking for.

I think that this is just the thing ! Thank you very much !!

The Teens book is great.
See also, http://www.amazon.ca/Arduino-Cookbook-Michael-Margolis/dp/1449313876

Leonidas25:
..... so that I can follow the tutorials available without knowing what I am doing...

many of us seem to take this path.