How to crochet the ribbed brim for the Jain Beanie pattern by

This tutorial shows you how to make the ribbed brim for the Jain Beanie crochet pattern.
Abbreviations used:
ch = chain
sc = single crochet
sl st = slip stitch
blo = back loop only
st(s) = stitch(es)
sk = skip
Jain Beanie crochet pattern by @loopyhandmade
This pattern is also a reference for the Jain Cowl by @loopyhandmade
Music: Natural Light (stops playing after 4 minutes)