Help! Knitting first Sweater..

I am knitting my first sweater, previously only done scarves or flat hat.
It says cast on 73 (81:89:95:103) sts and work 14 rows in g-st…
I dont know what the bracketted numbers are, are they to do with the size of the garmet?

Yes, the numbers correlate to the sizes offered. So you cast on 73 stitches if you’re doing the smallest size, 103 if you’re doing the largest, and so forth.

Thank you for that:slight_smile: