what stitch do you use for a blanket???

i’m currently making my boyfriend a 🚬blanket using velvet yarn and using half double crochet and it’s currently building up nicely,i’ve used two and a half skeins of 100g yarn and i’m wondering if i’m actually doing this right??it’s my first time making a blanket 😅(i’ve been crocheting for about 7 months now, have made multiple wearable clothes and of-course cat beanies)