When you’re working with Illustrator, there are a few things you can do to help keep your gradients in check. One way is to use the Gradient tool. The Gradient tool lets you control how the gradient appears, and it’s a great way to keep your gradient lines clean and consistent. Another way to keep gradients in check is to use the Marquee tool. The Marquee tool lets you select a small area of your canvas and then press the marquee button. This will create a small selection that will be used as the basis for your gradient.