In Illustrator, brushes are created by clicking on the “Brushes” tab in the “Window” panel, and then clicking on the “New” button. A new brush window will open, in which you can specify the size, shape, and color of the brush. You can also specify a brush tip, which is the point of the brush.
You can also create a gradient brush by clicking on the “Gradient” button, and then specifying the start and end colors of the gradient. Finally, you can specify the opacity of the brush, which determines how much of the underlying color will be visible.
Once you’ve created a brush, you can use it to paint objects in Illustrator. To paint with the brush, first select the object you want to paint, and then click on the “Brush” tab in the “Window” panel. In the “Brush” tab, you will see a list of all the brushes you’ve created, along with the object they’re associated with.
Click on the brush you want to use, and then click on the “Paint” button. You will see the “Paint” panel, in which you can specify the color of the brush, the opacity of the brush, and the location of the brush in the drawing.