What does SKP mean?

#1

My pattern reads: Decrease Row 1 (RS) (SKP,k6,k2tog) etc. What does the SKP mean?

#2

It should be in the explanatory notes at the beginning of the pattern before the CO, but it’s [B]s[/B]lip 1, [B]k[/B]nit 1, [B]p[/B]sso (pass slip stitch over).