Winding a bobbin for a sewing machine is a key part of being able to sew properly. A bobbin that is not wound properly is only going to cause you problems with the thread getting twisted and trapped (and probably snapping) or with tension problems when forming the stitch (leading to looping or loose stitches). []
Check out the Winding a Bobbin Guide
How to thread a bobbin
How To Thread a Sewing Machine & Wind a Bobbin
How to Wind a Bobbin Sewing Machine
Sewing and Dressmaking Blog
Kokuyo Bobbin Washi Tape Mini Roll Maker
A Review Of The Silver 1040 Sewing Machine
The AVL Bobbin Winding Guide helps you create a package perfectly wound to fit your AVL Shuttle. Used in conjunction with the AVL Electric Bobbin
Bobbin Winding Guide
Sewing machine tension guide: everything you need to know about