Advanced beginner: knitting in the round, ribbing, pattern reading

Hat is knit in the round.
HAT
Head circumference 46- 50 cm/ 18“- 191⁄2“, height appr. 24 cm / 91⁄2“
MATERIAL:
Gedifra Delizia (88% alpaca, 12% nylon; 60m/50g): 50 g off white color 01600 and 50 g light blue color 01605
(1 ball of each color)
Double pointed needles size 15 mm /US 10

Scarf is knit flat
RIBBED SCARF:
Approx. 200 cm / 783⁄4” long and 32 cm / 121⁄2” wide
MATERIALS:
Gedifra Delizia (88% alpaca, 12% nylon; 60m/50g): 50 g off white color 01600 and 200 g light blue color 01605
(4 balls main color, 1 ball contrasting color)
Knitting needles size 15 mm /US 10