There are a few things you can do to create a seamless pattern in Illustrator. The first is to use the Pathfinder tool. This tool allows you to create lines and shapes that follow a specific path. You can also use the Pen tool to add points at specific locations, or use the Marquee tool to make a shaped selection. The next thing you can do is to use the Layers palette. This palette allows you to group different layers together, so that they are easier to work with. You can also use the Command Palette to change how each layer behaves. Finally, you can use the Filters palette to change how colors are applied, or adjust how opacity is applied.
