You cannot do visual effects without them, they are everywhere. A green screen or blue screen would look totally amateur and utterly useless without them. They are a must, they make possible the matching of the movement of the camera with the movement in the background, to incorporate 3D elments. If your camera will move in a green screen, you need tracking markers. But after they've done their work, you need to remove them. How you do that? I will show you.

AdobeStock - Dust Particles

CreativeMarket - Dust, Powder and Particle Brushes 87666

35 High Resolution Realistic Dust, Powder and Particle Brushes for Photoshop.
Package includes 2 versions for Photoshop CS2-3-4-5 (2500px Brushes) and
Photoshop CS6-CC (5000px Brushes).

Adobe CS2+ | 2 ABR | JPG Preview | 147 Mb RAR

The Dust Explosion Photoshop Action is a powerful tool designed to create dramatic, dynamic dust and powder effects in your photos. With just a single click, this action instantly transforms your images by adding a stunning dust explosion effect, perfect for adding motion, texture, and energy. Whether you’re working with portraits, landscapes, or creative digital art, this action allows you to effortlessly introduce a sense of realism and impact. The included dust brush creates intricate powder details, enhancing the overall style of your artwork.