https://www.shutterevolve.com/mastering-raya-pro-course-use-digital-blending-plugin/

A Comprehensive Course on How to Blend any Exposures With InstaMask
You will learn exposure blending like an expert quickly, naturally and cleanly with some of the most difficult scenes around. From instant digital blending to luminosity masking, simple landscapes to complex interior shots, you will see how easily we can blend any exposures using Raya Pro.