My best guess to what you are asking is that you are referring to Front Post and Back Post stitches.
This would mean that you sitch around the stitch below the one that you are making. Either by bringing your hook in from the "front" (Front Post) or the "back" (Back Post).
The added Links would be good to view to see what is meant by "Front Post" and Back Post.
The word "post" in crochet is referring to the whole stitch--generally a "tall" stitch (such as a double crochet, triple crochet, etc).The reason the instructions refer to the stitch in the row below, is so the crocheter understands that you are to stitch around the stitch below--the "post" of the stitch. Otherwise, if the instructions stated that you were to double crochet the next stitch, you would understand that you would be double crocheting into the top of the stitch below, versus crochet around the length of the stitch.You also notice that the instructions will say to "back post double crochet (bpdc)" which means to bring your stitch around the post from the back position. So, "front post, double crochet (fp dc)" would mean to bring your stitch in from the front side of your work.
Its not possible to work around a crochet space because a space has nothing in it. However it is possible to work around a crochet stitch such as the post of the actual crochet stitch. You can work a crochet slip stitch over the top of crochet chains and stitches to get to another place in your crochet piece. You can also work crochet stitches around the post of a stitch. The term working around the space does not make any sense and is not good language for describing written instructions.
Yarn Over - when you wrap the yarn around the hook to form a stitch.
The letters sc are found in crochet instructions and are the abbreviation for "single crochet". The instructions are telling you to make a single crochet stitch in the last stitch of the row you are working.
for back post single crochet - insert hook from back to front around post of next stitch, yarn over and pull up a loop even with last stitch worked and complete single crochet for front post single crochet - insert hook from front to back around post of next stitch, yarn over and pull up a loop even with last stitch worked, and complete single crochet This is easier explained in photographs or video.
Sp in crochet patterns means "space" as far as I know. Generally, a space in crochet is created by the chain stitch(es) on the previous row/round. If your pattern states to sc, (single crochet) in the next sp (space) it means to pull the yarn around the stitch (the chain stitches) rather than through the chain stitch as you'd do when working into your beginning chain.
The basic stitches used to crochet are: slip stitch chain single crochet half double crochet double crochet treble crochet double treble shell pop corn
SS is an abbreviation for slip stitch.
Use a flower motif as a button. Crochet a circle, puff stitch all the way around to desired size.
It means that instead of working a stitch into that stitch you skip it and leave it unworked. For instance if you have 20 stitches and it says crochet in 19 and leave the 20th unworked, you would simply not crochet into the 20th stitch.
It means "single crochet". The stitch is the shortest of the crochet stitches and makes a very compact garment. Other notations can be double crochet, half double crochet, and even double triple crochet.Always read the whole pattern thoroughly before you begin your work.To sc in sc means to place your next single crochet stitch into the next single crochet stitch from the previous row. If your next stitch is a chain, for example, you would skip it and go to the next single crochet. Be aware that sometimes there will be a typographical error in a pattern, so be alert to how the stitch works in the pattern you are using.
As far as I'm aware, there is no "purl" in crochet, but there is in knitting.Knitting has basically two stitches, a "knit" and a "purl."In a knit stitch, the yarn is drawn through the previous row, by passing through from below. In a purl stitch, the yarn is drawn through the previous row, from above. This creates an effect, where on one side, a knit stitch appears to be knit, and on the other side, the same stitch appears to be purled. This explains why directions for knitting often speak of the "right (or front) side" or the "wrong (or back) side" of a project.Crochet has stitches which are a slip stitch, a chain stitch, a single crochet, a half crochet, a double crochet, a triple crochet, a double treble crochet, and even a triple treble crochet. I have not seen any patterns which call for a larger than triple treble crochet stitch.