It is simplified, but I think I am too simple a person to worry about using Photoshop. Obviously, any books that help you work Photoshop better are going to be a good recommendation for you.
For me though,
I have recently decided (after trialing Photoshop and Lightroom for
free) that I don't want to do post production editing so much that I
would require a program of the calibre of these ones. I'm just going to
stick with the free editing programs and keep to the basics. Want to
teach myself to be a better photographer and not rely on edits and
'layers' to enhance my images beyond recognition. If I start working
with these programs I think I am going to get too carried away and lose
focus on capturing good shots to begin with.
I still want to be able
to clone a little, saturate, sharpen, crop, change to B&W etc.. but I
can do all that with the Windows Photo Gallery on my laptop and the
freeware I got with my dslr.
Not that I judge anybody who uses these
programs, I'll just leave Photoshop and Lightroom to the Pros and the
serious enthusiast. I am only an amateur photographer who enjoys taking
photos to the best of my ability. All the hardcore editing stuff seems
like too much of a time waster for someone at my level.