I was just wondering what everyone thought were the essential techniques that a photoshop/lightroom/aperture/whatever user should know? For example, if you were to name your 5 most useful techniques to a post-processing newbie, what would they be?
1) Adjust Levels / Curves
2) Adjust Exposure / Contrast
3) Adjust Hue / White Balance
4) Sharpening
5) Basic cloning to remove dust bunnies.
That's about all I can manage, the rest I have to make a special effort to get right in camera.........
Everything else
PP is only used to gain something I can't do in camera. PP work is different for all themes. If you are forever changing WB, levels, dust bunny removal etc you obviously need to spend more time learning about your camera and light.
I love my photoshop but I love my camera more.
6) when to know you've taken a crap picture and not to bother
PP is only used to gain something I can't do in camera. PP work is different for all themes. If you are forever changing WB, levels, dust bunny removal etc you obviously need to spend more time learning about your camera and light.
I disagree. The only thing that's important is the end result. How you get there, nobody cares about.
Most important skills:
A good eye
A good technical understanding of the tools you're using.
Get those right, everything else just falls into place.
A good technical understanding of the tools you're using.

But surely if you are constantly having to adjust the basics like WB, levels, contrast, colour balance, then you lack
Like I said, I only do PP work if I need to 'change' the shot into something I can't do in camera, like adding a texture, changing the background or removing unwanted items.
Most essential skill:
Knowing when to stop!
I'm surprised that so many people are only using post to fix stuff. This seems such a waste to me.
It also depends on the quality of the glass you're shooting through. When I was using cheap glass I needed to boost vibrancy, curves etc on virtually every shot. Now I do much much less.
But then, if you have a good technical understanding of the tools, you wouldn't be constantly exposing incorrectly, would you.