The single crochet decrease (sc2tog or sc-dec) is used to turn two stitches into one stitch.
It may seem a little daunting, but with practice, you’ll be amazed at how it becomes second nature! Besides, it’s well worth learning because being able to decrease will open up a world of crochet possibilities.
Word of warning: American and British crochet terms are different! This video illustrates the American ‘single crochet’, which is called a ‘double crochet’ in British terminology.