How to understand ps layer?

Layers are the basis of PS image processing. They are films containing elements such as text or graphics. They are stacked together in order to form the final page. Effect.

In order to facilitate image editing without affecting the original image, you need to create a new layer and edit in the new layer.

For example, the background of the picture is a layer. At this time, you need to add something to it. Of course, you cannot operate directly on the background picture. If you create a new layer, operate on this layer. If you want to modify it, Or deleting it will not affect the effect of the original background image. If necessary, you can also merge layers, link layers, etc.

There are four layers in the picture below:

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