Help in learning YII2

Hello, friends, i’m new in YII2 in PHP and object oriented programming. I’m trying to create website using YII2 - any books or websites for absolute beginners?

here is list of sites:

http://www.yiiframework.com/doc-2.0/guide-README.html

http://www.bsourcecode.com/yiiframework2/

http://www.yiiframework.com/wiki/

Book

http://www.amazon.com/dp/1783981881?tag=gii20f-20

Extensions:

http://demos.krajee.com/

Thanks for advices, is it able to make conversation using webcamera and skype?