Slip stitch

When using circular needles and knitting a sweater top down, the pattern says : Neck *The first st of every row is slipped. What will this result in? Why does the pattern ask this and how do I do this?

Welcome to KnittingHelp!
This give you a slip stitch or chain edge. It’s a neater looking edge than the bumps that you get when you don’t slip the edge stitch. There are a few ways to do this. You can slip the stitch purlwise, meaning put the needles tip to tip and make the stitch move from the left needle to the right. Here’s a video that shows the ways to do a slip stitch edge.

I understand that the edge is neater but while knitting in the round it still does not make sense because there is not an edge. I am new at this

What pattern are you using? The fact that the row you quoted calls for slipping the first stitch of every row makes it sound like the pattern is written to knit flat (back and forth). You can do that on circular needles without joining to knit in the round.
Can you give us a link to the pattern or a pattern name?