Many of us Photoshop veterans (I guess with 18 years PS experience I’m a legit veteran) have learned about bad practices the hard way. But you don’t have to if you start with this collection of common PS user mistakes. I agree with the post and the big pay off in avoiding these is in efficiency and achieving top notch professional results. Worth a look.
12 Common Photoshop Mistakes, Misuses and Abuses | The Design Cubicle.
