Creating a center-pull bobbin is a great way to keep your yarn from getting too tangled up while you’re knitting.
With tail in palm, begin wrapping yarn loosely around 3 fingers. When 6″ of yarn remain, wrap yarn around center of yarn, bringing end underneath yarn to anchor it. Pull gently to tighten at center. Wrap a second time if desired.
See also: Hand Wound Center-Pull Ball, and Yarn is doubled throughout.