Every so often I read something that gives me a genuine A-HA moment. This helpful article on stitch length from Quilty Pleasures is one of those things. READ IT HERE.
She clearly explains what the various stitch length settings mean.
Adjusting your stitch length is important for sewing success. Short seam length will produce sturdy, even piecing for quilts. Basting a garment requires long stitches.
Read and learn. And then go sew something to show off your new knowledge. That is what I did.