This is a very useful cast on to learn since it allows you to expose a live edge of knit stitches that you can use for all sorts of things, including knitting in the other direction, doing a three-needle bind off, making sort of a folded hem to a garment and then binding off here.
In this Tiny Tutorial, Felicia Lo demonstrates how to work a provisional cast-on using scrap yarn and a crochet hook. If you can make a yarn over and pick up stitches, you can work this technique.
Pattern Info: Tabetha Poncho by Tanis Gray
Yarn: 9 skeins SweetGeorgia Yarns Superwash Worsted in Trinket (200 yd / 182 m per 4 oz / 115 g skein; 100% Superwash Merino)