Expert Retina / HiDPI Graphics in Photoshop & Illustrator https://www.udemy.com/mastering-retina-graphics
What are the requirements? If you are little familiar with Photoshop and illustrator then you will don't have any problem to take this course. Well if you don't familiar with those tool then it's ok I'm teaching from beginner perspective to master. Well, you will need Photoshop and illustrator installed...