Reading knitting patterns takes time to learn, but what you need to know to get started is very simple.
When you see CO, that means "cast on" or put your yarn on your needle. (Not sure how? Check out this video: How to Cast On for Beginners.)
When you see K1 or k1, that means knit 1 stitch. K stands for "knit" and the number stands for the number of stitches you will need to knit. As you learn, the patterns will increase in complexity. But keep in mind, to create a garter stitch potholder or scarf all you need to know is K[your number of stitches]. So if a pattern tells you to cast on 20 stitches, the pattern may read knit whole row or K20. Either way, you are just using the knit stitch every time.
When you see BO, that means "bind off" or take your yarn off your needle. (Not sure how? Check out this video: How to Bind Off for Beginners.)
