As a Photoshop user, you should strive to create make want ever you do be non-destructive. There are several techniques that can assist you in this endeavor. However, you should also strive to make what you are doing flexible. For example, while using CTRL+J can be used to copy a selection to another layer and then special effect (f/x) can be added to it. It is better to use a layer mask so that you can make any changes readily.
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