There are various resources that aren't part of official Yii website but are very helpful. Check these out.
is a community-driven news source for both official Yii announcements and
unofficial articles, blogposts and tutorials. Anyone can suggest news. RSS provided.
Community-powered showcase of projects and websites built with Yii including OpenSource projects.
Projects could be added by anyone and are published shortly after moderation.
There are many videos available. Check YouTube for "yii".
Below are links to two big video series community likes most.
If you need to learn good old Yii 1.1 this is a must read official tutorial.