When knitting after you have cast on when it comes time to knit the slip knot do you knit it or does it stay on your left needle Or do you knit it over to the right needle?

When you reach the slip knot, knit it just like all of the other stitches, throwing it off at the end just like the other stitches. When you have knit the slip knot, all of the stitches should be on the right needle, and the left needle should be completely free*.

*There may be some exceptions to this rule, as in circular knitting, but this will not be addressed until you are an advanced knitter, and you don't have to worry about that right now.