If you are a Motion Graphics Artist or a animator using after effects than you have to known Shape Layer's Repeater feature. Shape Layer Repeater help you to create duplicates of your shapes that can be arranged in geometrical pattern.
In this tutorial you will learn "Rotating objects with simple commands in Adobe After Effect by using Shape Layer's Repeater feature."
Watch this tutorial to understand the easiest way for creating "Animated Duplicate Objects Around a Circle in After Effects"
"Rotating objects with simple commands in Adobe After Effect by using Repeater in Adobe After Effects."