So I have been working with two main styles, the Headband and the Do-Rag. They both start here:
The Do-Rag then gets folded anywhere between here
(Shorter tail over neck)
And here
(Longer tail over neck)
From there it is as simple as placing the folded corner to your forehead
One knot
The Headband style just takes a couple more folds...
And again.
Its in the above fold and this one where you really determine the width of the Headband, the more folds before getting here, the thinner it will be.
Then take the bottom-left portion and fold it over everything. It is integral to the process you don't end up with a symmetrical fold on the last one. The little lip folding over gives you stability and integrity (of shape) throughout a day's wear.
Lift it directly to your forehead so the lip is on the inside.
I generally lean over because I want as much of my hair to stand out in as many weird directions as I can coerce from it; hair gel helps.
One knot
Two knot