There are a few things you need to know before starting to create a banner in Illustrator. First, the banner should be at least 300px wide and no more than 600px high. Second, the banner should be made up of at least two layers. The first layer should be your text layer, and the second layer should be your image layer. Third, make sure that your image is of a resolution that will fit on your banner’s width and height. Finally, make sure that your image is in RGB color space.
