There are a lot of ways to draw lines in Photoshop, but one of the most common is to use the Pen tool. The Pen tool is a great way to create straight lines and curves. You can use the Pen tool to draw a line between two points, or you can use the Pen tool to make a line that goes all the way around an object. You can also use the Pen tool to make a line that goes in both directions. The Pen tool is also great for making lines that are long or short.