I use New Stitch a Day to learn new knitting stitches.
Here is the 'Whelk Stitch' which I have been knitting this weekend.
I have added photos of each row to help when I make mistakes!
Row 1 (RS): K3, *sl 1 purlwise, k3; rep from * to end.
Row 2: K3, *yf, sl 1 purlwise, yb, k3; rep from * to end.
Row 3: K1, *sl 1 purlwise, k3; rep from * to last two sts, sl 1 purlwise, k1.
Row 4: P1, sl 1 purlwise, *p3, sl 1 purlwise; rep from * to last st, p1.
Repeat rows 1 – 4 until you have reached your desired length.