W indicates that the width of the currently selected object is 300 pixels; H indicates that the height of the currently selected object is 300 pixels.

The line tools in Photoshop shape toolset can create lines and shapes with arrows, which is one of the tools we often use in our daily design. Click the line tool in the toolbar to select the drawing mode according to your needs in the options bar. Here we choose Shape, and then set the attributes of the line tool, such as fill and thickness (set the thickness of line or arrow line in pixels), and drag with the left mouse button in the canvas to draw a line. If you hold down the Shift key and drag vertically, you can draw a vertical line.