Stockinette stitch
A smooth field of V-shaped knit stitches sits on the right side and purl bumps on the wrong side.
Counted practice swatch
Cast on 20 stitches and label the first row RS. This flat sample keeps 20 stitches in every row.
Work the repeat
Odd rows (RS): knit 20. Even rows (WS): purl 20. Repeat these two rows. In the round, knit every round.
Read the fabric
Unbordered stockinette curls at the edges. Add a garter or ribbed edge when the piece needs to lie flat; curling is not a missing stitch.