Sarah at the UK Vape Community made a short and sweet coil wrapping tutorial a while ago. Awesome.
From the description:
On the UK Vape Community group one of the most frequently asked questions from those new to coiling is, ‘who many wraps to make * coil’. We also point in the direction of this amazing site but it can be confusing at first. A quick tutorial and what all those boxes mean and what you need to input. Nothing technical here.