Shapes are the building blocks of whatever you create in PowerPoint. In fact, even a text box that you add to your slide is essentially a shape with a No Fill attribute. Once you get proficient with shapes, you can do so much more. For example, you can combine multiple shapes to create fancier shapes. However, you need to start with the very basics, and there’s so much to learn even at this foundation level. The first task you need to do is to insert a shape. Fortunately, PowerPoint makes it easy to do this task.
Learn how to insert Shapes in PowerPoint 2016 for Mac.

