Jersey Help

Hi, I’m not too sure what the following means (this is my first sweater)

Shape back neck
Next row (rs) : k20 and turn, leaving rem sts on a holder.
Work each side of neck separately.
Dec 1 st at neck edge of next 2 rows. (18 sts).
Work 1 row ending with a Ws row.

Shape shoulder
Cast off 8 sts at beg and Dec 1 st at end of next row.
Work 1 row.
Cast off rem 9 sts.
With rs facing, rejoin yarn to rem sts, cast off Centre 36 sts, k to end.
Complete to match first side, Rev shapings

Welcome to KH!
You’re going to be shaping the neck at each shoulder starting from the right shoulder first. Begin by knitting 20sts and then turning to the wrong side (ws). Turn as if you were at the end of the row and continue to work on these 20 sts only.
What is the name of the pattern?

Thank you! I eventually figured that part out. I’m making Teal by Kim Hargreaves. I’m stuck at the next part,

Working all side seams decreases as set by back, all front slope decreases as set by rows 11, 17 and 23 and beg with a K row, now work in st st as follows:

Dec 1 st at front slope edge of next and 16 foll 6th rows and at same time Dec 1st at side seam edge of 15th and 4 foll 10th rows. 72sts. Work 5 rows, ending with a Ws row.
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Beautiful pattern.

If you call the next row, row 1 then dec at the front slope on row 7.13.19.25.31.37.43 etc to row 97. Dec on the side at row 15, 25,35,45 and 55.

Thank you!!