Which is best source for learning joomla [closed]

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can anyboy tell me which is best online tutorial for learning joomla custom component and module devlopment

i would like to know the

1) best pdf source avaliable online available whether it is or free or not doesnt matter

2) best online tutorials

3) along with best joomla beginner tutrial

can anyone help me find out ?

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Book- Beginning joomla from novice to professional Dan Rahmel (Apress).

Building Websites with Joomla - Hagen Graf (PAckt).

Professional Joomla - Wrox

Site : joomla.org.

and not to forget ask your questions on SO.