There are many ways to duplicate in After Effects.
1. Select a layer and press Ctrl+D (Cmd+D).
This method will duplicate a layer either it is a pre-comp or a camera.
This method will duplicate a layer either it is a pre-comp or a camera.
If you duplicate a pre-comp, it will be the same pre-comp. If you make changes inside one changes will be reflected in another one.
There is a way to prevent it.
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