It has been a while since I posted a rib stitch, and this one is easy and so pretty.
SSK = Slip, Slip, Knit - Instructions for this decrease usually tell you to slip both stitches knitwise. I like to slip the first one knitwise, slip the second one purlwise and then knit them together. You can do whichever one you feel most comfortable with. You will get the same result, but for me slipping the second stitch purlwise makes it a little neater.