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www.youtube.com
right now is the best free online resources, here is sample:
https://www.youtube.com/user/NewWorldOps
For me "Digital Tutors" and "Lynda" are the best learning websites for any graphic designer.
They have the tutorials from basic till Advance level.
design.tutsplus.com
it is one of the best sites for various tutorials in photoshop
adobe.tv.com will teach you from basic to advance user... the technique and update which is so exiting those feautures especially in adobe photoshop CC2014 work so easy fast and very useful software for graphic design, photography, web and animation...
Lynda.com, specifically [Photoshop: One on one series] for the author: Deke Mcclelland.
I agree with my colleagues about the site Lynda.com, but I also advise to pay attention to the site https://design.tutsplus.com/courses
The best answer for you what asked, its from internet. Youtube can help you, but if you have to improve its your obligation. You need to get familiar with function and tools in photoshop.
you can fu=ind it at freepik.com
tutsplus.com is the best source
i give you playlist youtube link.. click link below and enjoy your tutorial.. Adobe Photoshop CS6 Tutorial
Lynda.com is one of the best in terms of video tutorials. You can google for .pdfs also with lots of tips & tricks