If you’re a beginner knitter and need a easy pattern to start out with, the Ridge Rib stitch is for you.
Cast on a multiple of 3 stitches plus 1 additional stitch
Row 1 - right side: Knit all stitches.
Row 2: Purl all stitches.
Row 3: Knit 1, * purl 2, knit 1; repeat from * to end.
Row 4: Purl all stitches.
Repeat Rows 1 - 4.

Ridge Rib stitch in the round