This month I am studying “Creating retina graphics with Photoshop and Illustrator”
This is an online class consisting of a bunch of pre-recorded video and some exercises.
I’ve got a lot of experience making assets at different resolutions for the same project. Though I suspect that there are some tricks I can still learn.
Update: Was rather disappointed. I didn’t come away with a single new piece of knowledge. It was good practice, but I think I could have spent the time on a more fruitful pursuit.
I managed to log 30 hours of study (watching videos) and then self-directed practice.