This is a very simple hat.

Cable cast on 120 stitches, join in the round.
Knit all around in (k1, p1) for 6 cm.
Then switch to stockinet stitch for 11 cm.
Then decrease by 8 stitches each round :
first round: k13 st, k2tog, 8 times,
second round: k12 st, k2tog…
until you have only 8 stitches on your needles, cut the yarn and pass it through the 8 stitches.

Done !