The Fractional widths command in the Character panel rounds character widths to the nearest part of a pixel instead of the normal whole pixel.

You can define the area that you want to crop out of any image using the Crop tool.

Option to merge a selected layer with the layer lying immediately below it?

Images in which mode are called 1-bit images?

Option to change the Background layer's appearance when part of your image is transparent?

Using Render filters, you can

How do you display the Layers Panel if it is not present on the desktop?

What does the Histogram show?

Which transform cannot be performed using Free Transform?

You've adjusted the size, hardness, spacing, etc. to a brush; how do you add it to your Brush Palette?

Which color mode can be converted to Duotone?