Move tool
1.0 toolLets you drag on the canvas to move and/or transform the selected layer(s). You can drag the interior to translate, drag a corner to scale, and drag outside of one of the corners to rotate.
Offers "autoselect" mode where the first layer under the cursor with non-zero opacity gets selected. Enable this with the tool options or transiently by holding Command.
Also lets you option-drag to easily duplicate.
See also free transform.