Basic Crochet Skills:
Slst – Slip Stitch
Ch – Chain
Sc – Single Crochet
Dc – Double Crochet
Joining a new coloursock/sport/DK weight cotton yarn, and a 2.5mm hook
you can you use any yarn weight with any hook (my suggestion is using a smaller hook, for a tighter crochet... less likely for the polyfil to pop out)