A gradient map converts an image to greyscale and then replaces each level of grey with colours of your choice.

Short key for Levels Adjustment

Highest tolerance for Photoshop tools?

What does the shortcut Ctrl + Shift + E do?

Shortcut for the rectangle tool, rounded rectangle tool, ellipse tool, polygon tool, line tool, and custom shape tool?

Alt/Opt + Ctrl/Cmd + G is used for:

Difference we get if the Artifact Suppression checkbox is not checked while moving the values from Artifact Slider in the image of Shake Reduction dialog image given above?

Which option in the settings of crop option overlay the cropped areas with a tint?

Which tool helps you move any content of an image and automatically fills the area from where the content has been moved with matching elements from the existing background?

Which option in the Shake Reduction dialog box gives the details about blur estimation regions in an image?

Which option helps to have the same settings in Photoshop workspace when we login from different machines?