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.
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.
SS is an abbreviation for slip stitch.
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.
If you think of the stitch as a letter T, it means work into the upright rather than the cross bar.
sl st in crochet means to stanted stitch
single crochet
The basic stitches used to crochet are: slip stitch chain single crochet half double crochet double crochet treble crochet double treble shell pop corn
American EnglishSingle crochet = Double crochetslip stitch = slip stitch
You'll have to be much more specific - perhaps include what happens in the stitch, like when you would half-double, double, and/or triple crochet, or a link to a video of the stitch.