Stitch abbreviations:

ch (chain stitch)
sl st (slip stitch)
hdc (half double crochet)
rsc (reversed single crochet, or crab stitch)
hdc2tog (half double crochet 2 together)
st (stitch/stitches)

This is what you’ll need:

2 colors of light weight yarn
crochet hook 1 or 2 sizes bigger than the recommended size on the label of your yarn; I went with 6mm (the label said to use 4mm-5mm)
Darning or yarn needle (optional)