The "ruler tool" can be used to arbitrary rotate. For instance be used to straighten an unleveled horizon or building.

When working with layers , what does the commanded 'Ctrl- Alt- Shift-E Do.

Painting over a 'layer mask' with a black brush will?

Short Cut key to change canvas size

Which filter retains edge details in the specified radius and removes low-frequency detail from an image?

Preserving the quality of your layer is one of the most important features of:

How large of a file does a PSD support?

Which one is not an auto-select option for the move tool?

Apart from the keyboard shortcut (Alt+Ctrl+G), how can you quickly create a clipping mask from a layer?

It is possible to create a hyperlink in Photoshop.

A histogram...