Along with the color adjustments, we can use layers to split the image and work on the composition of the elements. Sometimes we will have to add a background, or simply split the image on layers to fine-tune the colors of a specific area.
To work with layers, we use the Layers dialog:
If we create a new layer, by pressing the corresponding button, an empty layer will be created above the image. To locate it below the image, just click on it and, drag the layer down.
Another good practice is to duplicate the main layers before you work on some adjustment. This way, any mistake will be applied to the duplicates, and the original layer will be ...