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There are Many talented youtubers Who Upload their techniques and Lessons worldwide
The Best till i have Came accross are as follows:
2.IceflowStudios Photoshop Video Training
4.TutorVid
There Are also awesome blogs and articles daily updates
Smashing magazine
Designmodo
For learning latest updates and techniques go to adobe tv.. and for advance creatives techniques, go to abduzeedo? creattica, and even behance.
Just search about Photoshop manipulation ... and you'll find a lot of videos and channels for learning photoshop.