13 The easy way to turning smooth curves into corners and vice versa || Adobe Illustrator

By Shakir Software on youtube.com

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In this step you'll learn about converting curves and corners. It applies to almost all shapes, and can be done using the Pen Tool, the Anchor Point Tool, or the White Arrow. You can convert curves to corners and corners to curves, and you can also join, cut, and remove anchor points. This is a great way to create shapes and paths within Illustrator.