From my web site Crochet Cabana.
yo, insert hook into the back of your stitch (in other words from back to front), go in front of the post, pull through (3 loops on hook) bringing stitch up to height of previous stitch, yo, pull through 2 loops (2 loops remaining),
yo, pull through remaining 2 loops to complete stitch
There is a video demonstration of this method on the web site and at my YouTube channel.
Instead of inserting the hook into the top of the indicated stitch (the 2 strands that look a bit like a chain), you put the hook round the post of the previous row. If you think of the previous row stitch as a capital T, you work round the vertical column rather than into the cross bar.http://www.dummies.com/crafts/crocheting/stitches/how-to-work-front-post-double-crochet-stitches/
It means alternate between front post double crochet and back post double crochet.
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.
There are about 6 basic crochet stitches them being: ch~chain stitch sc~single crochet dc~double crochet hdc~half double crochet treble ss~slip stitch most patterns will use one of these stitches or a combo of some of them. .
You can count the stitches by looking at either the stitch post or the top loops of the stitch. Don't forget to count the beginning turning chains as a stitch.
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.
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.
The basic stitches used to crochet are: slip stitch chain single crochet half double crochet double crochet treble crochet double treble shell pop corn
Common crochet stitches abbreviations used in patterns include: ch (chain), sc (single crochet), dc (double crochet), hdc (half double crochet), tr (treble crochet), and sl st (slip stitch).
In crochet patterns, the abbreviation "sts" stands for "stitches."
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.
There are many ways to find books on crochet stitches. You can go to the internet, or the local library, or some yarn shops will also sell them, or even teach you some basic stitches.