Here is a great pattern for beginners!! It will teach you crochet basics while also giving you something you can use at home (surprise!!):
Round 1: ch 5, sl st to first ch to form a loop/ring
Round 2: ch 1, 10 sc in ring (10 sc)
Round 3: ch 1, sc in same st, ch 3, [skip next sc, sc in next sc, ch 3] 9 times, sl st into first sc (5 sc, 5 ch-3 sp)
Round 4: [sc, hdc, dc, 3 tr, dc, hdc, sc] in each ch-3 sp, sl st into first sc (10 sc, 10 hdc, 10 dc, 15 tr)
Glue a piece of magnet to the center and there you have it: your first crochet fridge magnet! Enjoy!!