Welcome to Knitting Help!
Knitting creates a stitch that is a purl on one side (bumpy side) and a knit on the other (looks smooth like V's). When you knit ribbing you knit the knits and purl the purls. Moss/seed stitch you do the opposite by knitting the purls and purling the knits. So knit or purl across and when you come to the first border stitch you'll either knit or purl depending on what the stitch is. Does that help?