Masks, channels, and layers are the three obstacles in learning Photoshop. But I think the reason why beginners find them difficult may be that many people complicate simple problems when describing applications. For example, masking is originally a very simple problem, but many people don't understand it. Feeling this, I took the time to create this tutorial, hoping it will play a certain role in helping beginners understand masking.
Due to the rush of production, I did not choose the color carefully. You can change the filling of the new layer above the background layer from black to green, blue, yellow, purple and other colors other than black, white and gray, which is more useful for understanding the mask.
