Go to edit/preferences and check the box 'additional plug-ins folder' and select a folder.

While working with a mask press the \ key to work with a transparent mask, kinda like the quick mask. Press \ again to return to the regular mask.

If you want a larger preview of your mask; ALT + Click on the mask and you'll be able to edit the mask in the document window.

Select a foreground color, select the Paint Bucket Tool (G) and now click on the gray background while holding down the shift key.

We can duplicate an image by going to image/duplicate, but a quicker way is to right click the top of you document window. A window will pop up in which you can select 'duplicate'.

We can delete the preference file by holding down Ctrl+Shift+Alt when we start Photoshop. Be aware that all your previous Photoshop settings and preferences will be lost.

Go to Edit/Color settings and make sure that you have selected Web Graphics Default and SRGB, otherwise your image might look too dark.

		PC	Mac
		Alt	Option
		Ctrl	Command
		Right Click	Control

Hold down the Shift key and click on the close button of any open Document window; this will close all other documents too.

Sometimes you want to merge all visible layers (what you're actually seeing in your document window) on a new layer; create a new layer and then press Ctrl+Alt+Shift+E (Windows) or Command+Option+Shift+E (Mac)