Clipping is a function that lets you apply shadows, gradation, texture, and more without using Magic Wand tool.
Prepare an illustration whose base has been colored.
Base coloring can also be done using the Bucket tool, as long as the line drawing is closed without openings.
Let's separate the skin, hair, and clothes into different layers before coloring them.
Open ① the Layer window, add ② a new layer on the hair layer.
Tap on ③ Clipping to turn it on.
This is an illustration with clipping for comparison. By using clipping, you will be able to work much more efficiently.
Finished.