How to modify shapes with the PEN TOOL in Illustrator CC

By graphics grrrl on youtube.com

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In this tutorial, you'll learn how to use the pen tool to modify shapes that you create with the shape tool. You can use the pen tool's feature of adding and deleting anchor points to modify the shape. You can also use the direct selection tool to select the points of a shape and use the add and delete anchor point tool to modify the shape. Additionally, you can use rulers and guides to precisely add anchor points to the shape.