I need help to read this pattern

hi everyone, I am new at knitting. I learned how to knit from Google and YouTube. I am trying to knit this baby sweater but I’ve been stuck on this part. I didn’t quite understand what it is mean when I’m reading it. Can someone please help me explains how it is work ? Thank you so much and here is the pattern.

When piece measures 22-24-27 (28-31) cm [8¾”-9½”-10 4/8” (11”-12¼”)] slip the first 9-10-11 (12-12) sts towards mid front on a stitch holder for neck. Bind off to shape the neckline at the beg of every row from neckline: 2 sts 1 time and 1 st 3 times = 52-56-62 (72-82) sts left on shoulder/sleeve. When piece measures 26-28-31 (33-36) cm [10¼”-11”-12¼” (13”-14¼”)] insert a marker in piece (= mid shoulder). NOW MEASURE PIECE FROM HERE. Continue for 1 cm [3/8’’] and put piece aside.

Ps. Thank you so much for taking your time to read this thread

There’s a lot of info there. What exactly are you having trouble with?

Jan in CA the slip part. It asks to slip 12 sts. The next line I don’t know what to do

Is this a pullover front or a cardigan front? The left cardigan front or the right?