I learned how to use a mask. And also how to delete parts of it and putting it on any part of the image you want. I also learned that you could remove pimples, any type of ring or anything on the image you don't want. I learned how to make the skin on a person look all the same and kind of soft-ish. I thought that was really cool.

I also learned how to use curves. I thought that was really cool because I never knew how to do that. I think that it is really important most of the times too.