I just wrap them round my hand if they're small like the plug-it cords or like a lasso if they're longer. I know there's talk about caring for them and not breaking them internally, but I carry spares so if one breaks it's not going to stop work and they're cheap enough that I'd rather shell out a few £££ every now and then when they do break than expend brain power/energy on worrying about pedantically wrapping them in some convoluted method.
That said in over 30 years I don't think I've ever had a cord ever fail on me internally due to improper winding. Any wear and tear is more obviously external and from abrasion through use, being stepped on, caught in doors, run over, etc.