A dot screen post-processing effect is a visual technique used in computer graphics and image processing to simulate the appearance of halftone printing. It creates an image by converting continuous tone images into a pattern of dots, similar to how images are reproduced in newspapers or comic books.
How the original image and the effect are blended together, in most cases it does not make sense to deviate from the default value.
The angle of the dot pattern
The scale of the dot pattern.