Today's photography tip is to get it right in the camera.
Just because you CAN fix something in post-production, doesn't mean that you should. As a matter of fact, it normally means you shouldn't. Fixing something in Photoshop, after the fact, is not only not usually necessary, but it is also usually much more time consuming. If your client's hair is out of place, or there is something in the background, then it is much better to fix it during the session. How much you are able to earn from a session is, to a large degree, dependent upon how long you spend editing and retouching the images. So... limiting the amount of retouching needed will increase your profitability. Photography is your craft. If you don't know how to get a correct exposure, correct white balance and attend to the details of the images you are creating... then go learn. Take a class.... or start watching Creative Live. You are a photographer... not a graphic artist... not a Photoshop Guru. You should be able to get your photographs correct in the camera. Use your software tools to enhance the images and make them perfect, not to get them right to begin with.