by adding a slip stitch just before the previous stitch
I would say most likely that means "slip stitch."
No, the stitch up after a magic loop slip stitch does not count as your first stitch, the magic loop slip stitch does.
SKPO stands for slip knit pass over. In other words, you slip one stitch, knit one stitch, then pass the slip stitch over the knitted stitch, thus decreasing one stitch in your row of knitting.
I would say most likely that means "slip stitch."
slip 1 - insert needle into stitch as normal then just pull it off the left needle onto the right without knitting or purling it
no but you can smd
Slip Stitch
In knitting, sl1 means to slip one stitch. To do this simply slip the stitch from the left hand needle to the right without knitting it. Stitches can either be slipped purlwise or knitwise. If slipped purlwise, the stitch will not twist but if slipped knitwise it will twist. Therefore, if the pattern does not specify which way to slip the stitch, it is best to slip purlwise. See the related link for a diagram showing how to slip stitches.
Slip one stitch (from the left needle to the right), knit the next 2 stitches together, than pass the slipped stitch over the finished K2tog stitch.
A picot stitch is made with chain stitches. For a small picot, chain 3, then put a slip stitch in the first chain stitch. For a larger picot, do 5 stitches the same way. If you chose to change the amount of stitches, odd numbers are best so that there is a middle stitch.
There are two ways to slip a stitch, knit-wise and purl-wise. When in doubt, generally you should slip purl-wise. Insert the needle into the stitch to be slipped either as if to knit (knit-wise) or as if to purl (purl-wise). Then slide it off the left needle without pulling a new stitch through it. That's all there is to it. Here are some applications: For a tidy selvage edge, slip the first stitch of each row purl-wise. For a decrease that is the mirror image of a K2TOG, do an SSK (Slip, Slip, Knit). Slip one stitch knit-wise. Slip another stitch knit-wise. Slipping knit-wise gives the stitches a half twist. Now slip them both together back onto the left needle, passing them with the needles held tip to tip. Knit them together through the back loops.