sc - single crochet https://www.youtube.com/results?search_query=crochet+single+crochet inc - increase https://www.youtube.com/results?search_query=crochet+increase dec - decrease https://www.youtube.com/results?search_query=crochet+decrease sl st - slip stitch https://www.youtube.com/results?search_query=crochet+slip+stitch+