https://www.skillshare.com/classes/Textured-Dot-Pattern-in-Adobe-Illustrator-A-Graphic-Design-for-Lunch%E2%84%A2-Class/1152159428
Illustrator for Lunch™ is a series of short video courses you can study in bite size pieces such as at lunchtime. In this course you’ll learn to make a textured dot pattern in Illustrator. In this design we will use a layer to act as a mask to ensure the texture appears in only in the places we want to see it. The design can be created in ALL VERSIONS OF ILLUSTRATOR.