In this post I will tell you more about the abbreviations I mention in my crochet patterns.
hdc half double crochet
dc double crochet
sc single crochet
sl st slip stitch
tr treble crochet
This website has a listing of crochet terms and their abbreviations. It also explains everything with pictures and/or videos. It is a great help.
When I started to crochet, I used the slip stitch manner to finish a row. I recently found this way of doing it on Pinterest for a more beautiful finish.