After Effects Precompose | Tutorial for Beginners & How to use it

What is Pre-Composing and how to use Precompositions in After Effects?
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One of the most imporatnt things we can do in After Effects to save time and order up our project is using PRE-COMPOSITIONS to arrange certain objects into one container. Precomposing in After Effects allows us to group objects, nest compositions and precompose several layers into one (new) compositoin. This frees up our working area, separates files from each other and allows us to combine elements and apply effects to them in bulk.