I’m new to knitting so i picked a pattern that is for beginners however, there is a bit about the shoulder shaping that i
m a little bit confused about:
Continuing with shoulder shaping, place center 12 sts on holder, join 2nd ball of yarn and, working both sides at same time, bind off at each neck edge 3 sts once, 2 sts once, and 1 st twice. Continue to work shoulder bind-offs until 1 st remains on each side. Fasten off last st.
The bit about placing 12 stitches on a holder and working with a second ball of yarn is confusing to me. After i start binding off the shoulder, what happens to the 12 stitches on the holder?