Thank you all for your replies and the extremely useful info they contained.
So, when a pattern says to K1, P1 for ribbing and I'm using straight needles, I knit the 1st row, purl the 2nd row, etc.
When a pattern says to K1, P1 for ribbing and I'm using double pointed needles, I get ribbing by knitting the 1st stitch, purling the 2nd stitch, etc?
I just want to make sure I understand. Thanks for your patience.