Tutorial For Making Yii Extension ?

Hi Guys,

   I am new user at yii forums so apologies if i am re-posting a same topic or posting in wrong section. My problem is i cant find a good tutorial nor could i figure out to make a yii extension so can any one be helpful for providing a link for a good tutorial for developing and deploying the yii extension.

This was the best i could find but it does not give the whole picture for an extension.

(sorry my first post cant embedd link)







I would prefers the link is not of yii official extension documentation.