Maybe a silly question

I’m working on a sweater for my husband and have come to a halt.

Instructions read…

Shape armholes: cast off 11 sts beg next 2 rows. 65 sts.

so I get the cast off the 11 stitches…but its the beg (beginning) next 2 rows thats getting me.

Please help!!!:passedout:

It means that on the next row, you cast off 11 stitches at the beginning and then keep knitting the rest of the row, and then on the next row after that, you cast off 11 more stitches at the beginning and then knit the rest of the row.