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When you first install Photoshop, CMYK is the default color profile. Many tend to forget about this vital aspect and end up wondering why their photos look totally different when opened with different software or when printed at a conventional lab. CMYK is usually used for industrial printing, so your best bet is to use either standard RGB or sRGB. Just make sure your camera is set to match the same profile.
Using layers is one of the best parts about Photoshop. many first time users ignore this technique or don't even know how to use it. There are a number of considerable advantages to using layers: less damage to the image during editing, they give you more control, you can change the opacity of each new effect, blending modes to vary the way they interact with each other and so on.
Working without shortcuts, this may seem like more of a personal choice than a mistake.
Overdoing it, dodging and burning, HDR filters, vignetting, vintage tones are all great effects. You just need to learn to use them properly.
Mistakes while using Photoshop, they will occur. Unless you want to make a difference in how you possibly over edit, add too many effects or you simply do not end up saving your results. This 6 common mistakes can be avoided if you just read through the article.