Do a google search https://www.google.com/search?num=100&lr=&newwindow=1&safe=images&as_qdr=all&site=webhp&so urce=hp&q=learn+Photoshop+CC&oq=learn+Photoshop+CC&gs_l=hp.3..0l4.3932.15398.0.16770.20.19 .126.96.36.199.156.1666.15j4.19.0.cprnk%2Cremre%3Dgame...0...1.1.32.hp..0.20.1681.e57E_ZFGT9g
There are many Free tutorials and sites with monthly fees that offer cources go at your own pace. Sites like lynda.com....
Lynda.com is very good, but you have to pay a monthly subscription
103 courses for CS5
I prefer the Vide2Brain tutorials, which have a similar subscription model, but tend to be more detailed, and perhaps more advanced. I'll let you search
Then there is Kelby Training
And a shed load of others I have forgotten.
For free stuff, look for Adobe TV, Kelby TV, 'You Suck at Photoshop' on YouTube, Tuts+, TipSquirrel, Planet Photoshop (pretty much merged with Kelby TV now), and tons more no more than a Google away.
If you want books, it depends on how you want to use Photoshop?