Photoshop is a powerful image editor that can be used to create beautiful graphics and photos. However, it can also be used to create simple designs and illustrations. One of the most common ways to adjust brush size is by using the Brush tool. To use the Brush tool, click on the brush you want to use and then drag it around the canvas. You can also change the size of the brush by clicking on its thumbnail and then dragging its size around the canvas.